Gonna highlight a couple games I personally enjoyed but haven't seen mentioned.

https://store.steampowered.com/app/2533600/Bloodthief/
This is gonna be popular. Titanfall Slide hopping first person air dash slasher with a massive skill ceiling.
Solid extremely high speed movement if you are good enough and want to spend the time grinding out a path.
Last combat focused room in Doom Chapel was challenging. I'll probably enjoy this for finding all the secrets and getting a clean run or two but I don't see myself grinding for times speedrun style.
https://store.steampowered.com/app/3486280/Long_Knives/
"Played" through the prologue, just under an hour.
Exceedingly minimal but it's enough to set the scene and I'm kind of wishing other cyoa had similar.
Kind of a slow opening but it's got me hooked to see where it goes.
I think I've accessed ch1 but it's not translated...
https://store.steampowered.com/app/3532140/Super_10_Pin_Demo/
I loved it. Aesthetics, menu design, soundtrack, tight controls.
https://store.steampowered.com/app/2471320/THE_RIFT/
Haven't played a time trial flight sim that actually controlled well since Strike Vector and its rerelease.
"Campaign1" is the most difficult track in the demo by far, more reliance on correctly using the gimmick blocks.
Makes me think of trackmania if you know what I mean.
https://store.steampowered.com/app/3641250/FISH/
feesh feesh feesh
Waverace fishing. It uh, kind of actually works. Super rough, interested to see where this goes with more dev time.

https://store.steampowered.com/app/3565460/Tahitian_Driftin/ Control scheme/drifting a bit odd, really solid otherwise.

Bonus not nextfest demo I played https://store.steampowered.com/app/3509160/BAIONLENJA/
I was a solid rocket jumper back in the day, but terrible at b-hopping. Somehow in BAIONLENJA the b-hopping is easy and feels smooth but I couldn't get a hang of the rocket jumping.