Gonna list out everything I've played worst-to-best for the sake of getting more positive as I go.
Spooky Express
Seemed like a cute puzzle game but the presentation is really dull, the levels in the demo were mediocre, the controls for both mouse and controller were really awkward because of the slightly-isometric angle, they lock two levels in the demo behind signing up for their newsletter, and the demo crashed the first four times I tried to launch it. Total shitshow.
RA RA BOOM!
This was disappointing. The presentation is very good with nice character designs and decent voice acting, plus "sci-fi cheerleader beat-em-up" sounds sick. Sadly the actual gameplay feels really stilted with Heavies not stringing from lights well, air attacks stopping your air momentum dead with no real jump-ins, your infinite-ammo gun being better than hitting things 90% of the time, and the Dodge the controls screen telling me I had never working. The boss fight at the end was also genuinely awful. A real shame.
Baki Hanma: Blood Arena
The presentation is solid even if they sacrificed animation for accuracy to the anime, and it's otherwise just Punch-Out where you build up to a super instead of earning stars. You only get one fight and then like 45 seconds of another (the latter at least teasing an interesting mechanic where you can get blinded on one side). Would be higher if I didn't hit the end of the demo in 5 minutes.
Hunter X Hunter Nen Impact
Trust me, I LOVE Eighting's fighting games, especially UMvC3 which this game is pulling the most from, but this just isn't quite it. The control scheme is odd, the feel of the characters is a little odd, the combo structure seems just awkward enough to throw me off. I think it's because none of the demo characters really click with me except MAYBE Leorio. I also hate to say it but Marvel Tokon & Invincible Vs are crowding out the space it's trying to occupy with much bigger IPs.
Hotel Barcelona
This is pretty much what I'd expect from a Suda/Swery collab roguelite. Awesome character design, solid overall aesthetic, nonsense space, a couple interesting mechanics, and very stiff & awkward movement/combat. The size changing and the ghosts of your past runs having their hitboxes active are really interesting ideas but it'd need to feel a lot better moment to moment. I want to fuck the main girl so bad.
Morbid Metal
Obviously compares itself to DMC/Bayo but it's like a non-mobage version of Honkai Impact with jumping and roguelite elements. You have a basic string, two cooldown moves, a super, and the ability to swap characters on the fly. It's fine for what it is and scratches the character swapping itch for these types of action games. The movement is pretty smooth for how linear the levels are but there are small secrets if you can platform with them so that's neat. It didn't run great on Medium and every time I started a run it force-changed its resolution for some reason, plus I didn't feel compelled by most of the upgrades, so I docked some points.
Dispatch
Worst part first: the writing is unbelievably tryhard when it's trying to tell a joke. Letting the VAs just banter naturally was more charming than any clear punchline, but they keep trying to tell jokes and it's going to get grating the more the game goes on, and that's on top of a couple of characters that are really annoying from the jump. The good: the gameplay you get is actually really interesting in terms of resource/time management and trying to match each hero's stats/personality to each job. The great: for in-engine the game looks incredible, this could pass for something airing on TV, and the expensive voice cast mostly (MOSTLY) pulls their weight. Also Invisibitch and Malevola are sexy.
BALL X PIT
I don't often follow Vampire Survivor clones but this one is really fun just because you're angling and bouncing balls like it's a brick breaker (and not catching them just shortens your reload time instead of penalizing you). The base-building aspect seems tacked on but there's a lot of potential in just having fun watching the balls get caught behind enemies and bouncing around a ton.
Break Shot Hero
Really great premise combining TRPGs and Billiards, charming presentation that comes off like a late PS1 release or something to that effect, plenty of mechanics to keep it fresh on top of randomized levels to practice/grind. The two control schemes seem good in practice but they're either a little inconsistent at reading minor movements OR my mouse is really shit (could be both). That said, I did see some mobile game-adjacent design like time-gating free refreshes on your drop tables for units.
Demonschool
Unsure if this is from this Nextfest but I saw a trailer for it this week that pointed out the demo. I'm usually not one for Persona-style games but I like Tactics and the combat here really has a snappiness to it once you get the rules. Good sprites, great music, really great backgrounds, decent character writing. I'm pretty impressed.
Absolum
Being half of the Streets of Rage 4 team made this one of the top demos I wanted to try and it has been mostly really enjoyable so far. The systems aren't as tight as SoR4 or other top-tier beat-em-ups but the controls certainly are tight and fluid, with the dodge/parry/roll/dash thing being insane for being able to cancel strings early (the dwarf can just do Jab 3 xx Roll for constant offense). The enemies are a little weak but not bad, though the boss I fought a few times was kind of bad because it just has armor until you hit him enough but is otherwise not that difficult to avoid if you're careful. Overall it'll be a really fun time like SoR4's roguelite mode even if it's not best-in-genre like SoR4 itself.
Dead As Disco
If this was by playtime this would be #1 by far, I have over 5 hours and I'm itching to go back. The core combat is just if Hi-Fi Rush was Batman Arkham combat instead of a simplified DMC/Platinum-style, but that makes it so much easier to focus in on the beat and try to maximize your score. The main game is VERY early but Infinite Disco and its ability to chase S-Ranks AND upload any audio file to fight to have really pulled me in. I just threw some Anarchy Reigns and Lethal League music in there and it was super fun. I expect this to be one of the "darling" games of the fest.
Ninja Gaiden: Ragebound
Haven't played Game Kitchen's other games since I'm not into the Soulsroidvania thing Blasphemous is going for but I really respect what they've done here. The sprites are somewhere between Saturn & GBA in terms of style, the music is on-point, the mechanics are simple but layered (and seemingly doled out over time to you), the level design is hitting a great sweetspot, and the ranking system really makes you take every part of each stage into account. It just comes together so well based on the levels they showed.