EDIT: Turns out I was playing an early build... 🥴
A brutally tough 3D Downwell. I like it 👍
I'm terrible at it, but I like it 😁
I was having issues where moving the mouse didn't feel like it reoriented the player properly - where you'd expect to rotate the player and still have Up translating to "relative forward" - so I found my little guy frequently moving in unintended directions, which in turn made lining up those jumps onto tiny platforms far trickier than they should have been.
Once that's fixed, I can see this being something very neat and trippy - I was getting sort of "what if ZX Spectrum, but 3D?" vibes.