This game definitely has potential!
The overall flow of gameplay is pretty nice (if a little bit gimmicky at times), and I really like the way that you can punch holes in certain walls. There are some obvious issues with the rest of the game, however:
- Graphics are probably the biggest complaint I have. The text (outside of the title screen) disrupts the flow of the game to get you to turn your head (more on that later) and look at a tutorial in the air. I think you just need some kind of floating sign or a different, smaller font for the tutorial. Another way I can think of to improve the graphics is post processing. A game like this could look at least 3 times better with some light bloom and color grading.
Mouse sensitivity needs a slider. I won't dwell on this for too long (as it's already been talked about in other comments), but I had to increase my mouse sensitivity to maximum for a decent experience.Just read that you're fixing this. Great!
Other than those, the rest of the issues I have are actually pretty minor. Obviously, sound is non-existent, but that's made up for by the solid gameplay.
I can definitely sense some inspiration from Karlson 3D here, but I like how you added your own twist on it with the wall-breaking mechanic. I do wish more walls were breakable at times, but the great level design mostly distracts me from that. There are a couple of levels that feel a little too gimmicky at times, though. I feel like a boost to the FoV could help with some of it, but when I say "gimmicky" I'm mostly talking about how walljumping works. It doesn't feel like you should be able to jump along the ceiling, and I think a good way of fixing that would just be to make it so that you can press space once to attach to the ceiling and press it again to detach.
Overall, I think this game has some strengths and some weaknesses. I think the gameplay makes it worth playing, but I wouldn't call it totally finished until the graphics are amended. Great potential here!