Took me a while to understand what I was supposed to do. I was about to quit but persisted, and ended up getting stuck on the level with the spinning wheel (I think I know what I have to do but it's too damn hard lol). I especially liked the bird level, it reminded me of some of the crazier happy wheels custom levels.
All in all I think the game would benefit a lot from having more descriptive text at the beginning, or a tutorial. It's not very clear that the shadows actually stop the fall, and that you are supposed to move by shooting.
I think it's a very ambitious game, considering everything is done with a single mouse button, and some minor fixes regarding clarity would probably prevent a lot of bad reviews, since in its current state it's kind of hard to understand and play. Once you do understand, some levels can be really fun though.
Also the rope physics seem kinda weird when the shadow it's attached to is moving.
EDIT: Nevermind I beat the spinning wheel level, now I'm on the sand clocks one, will update if I beat it!
EDIT2: Can't beat level 13, these skulls are beating my ass, I gave up for now
EDIT3: Stuck on level 16, I'm inching towards it! the stalactite swinging level went from very frustrating to really fun, it also reminded me a lot of happy wheels.