I like this game.
Although its nothing super fancy, it gets the job done. I think this game has a strange sense of charm. Crouching is an interesting mechanic to add to a platformer, and crouching mid jump to make it through those narrow gaps was quite fun! If you want to improve how the game feels, I would suggest looking into "coyote time", its a game design idea that would help to make the jumping feel more responsive and helps the player feel more in control of the character.
I think this is one of my favorite games that I've played today. When you get around to rating games as well, come around and have a look at ours!