Hello.
I have some feedback about your game.
Firstly, crouching is pretty broken. If you go from the idle to the crouch state, it just does not work. Besides that, it's pretty hard to notice if you are crouching or not.
Secondly, the level design is pretty bad IMO. Why? Let's start with the tutorial. You cannot restart there. Okay. Now, on actual levels, pretty much one mistake means you are soft locked and have to restart. This feels, as a player, so fricking bad. Furthermore, on some levels you can just skip steps. On level one, for example, why would I even open the door on the bottom right? To use one key to get another? Does not make sense to me.
Thirdly, climbing walls is pretty broken too. It's extremely hard to leave them.
In addition to those things, your game does not have coyote jump. This means that if you try to jump a couple of frames late, you don't jump.
Additionally, music would be nice too.
Lastly, I don't really like how your game fits the theme.
Despite everything I mentioned, I still beat the game:
( Note: Don't take this criticism as something against you, the developer. Just trying to help. )