Dark Souls of nail games…
Enough has been said about the controls, so I'll just add that it wasn't the best idea to make the jump sound effect twice as loud when you hold down the button.
I think the sprite of the nail is well-animated, and the idea of a hammer being the villain of the game and not just a tool is also fresh.

I really like the idea but as other comments said, it would be better to keep the keys pressed to lean than spam them

The movement in the game is very cool (like a mix between jump king and cleaning the system) and felt pretty fun when you got it right.  The control scheme isn't great, having to mash the buttons to change directions was pretty annoying and the j/f keys were awkward (maybe a, d, w instead?). Sometimes the nail would get off the ground when you were leaning and you wouldn't jump. I think some 'coyote jump' feature where you could still jump a little after leaving the ground would've been nice. I beat all 3 levels, and I think that you could've eased the player into the difficulty of the second 2. The ability to die felt out of place, and was more frustrating than just falling and losing your progress. I also encountered a bug twice in the second level where the hammer clipped into the ground and I got softlocked. The movement was actually pretty fun when it worked like the jump at the end of the 3rd level where you need to lodge the nail head on the post was a super cool idea (the two falling platforms were pretty diabolical though). I think with a little more polish and a better difficulty curve this game would make this game would be easier to get into, but the movement and level design is still pretty great. I hope you keep on making games and improving!

Fun concept, but I found the controls very frustrating having to hammer f and j very fast to have any effect.

Fun concept, but I found the controls very frustrating having to hammer f and j very fast to have any effect.

Intressting game, but my skills where not able beat you game mechanic XD. The polished art so far looks nice.  and the "boing" soundeffect sounds nice.