I had fun playing the game and figuring the levels out. They are quite varied and I found them difficult but not too much.
I think the mechanic of screws resetting after picking up the key could be explained in the game, as I haven't noticed it until I read the description after beating the game already.
And it has the simple oversight that's in quite a lot of games, that you can move with A/D but not jump with W. Probably due to using Axis "Horizontal" for movement (it has alternative buttons A/D) but jumping with just KeyCode.UpArrow :)