The arstyle of the game is awesome, I love it. I think the controls, as others have said, could definitely use some work. With a platformer, you want to feel like when you die it's your fault, not the game's fault, like you shouldn't have to compensate for the game's controls. As someone who made a platformer with bad controls before, I get it though, it's hard to find a good balance lol.
Other than that the game mechanics are fine, maybe if the death objects like brambles stood out more it wouldn't be so annoying when I died to them, but yeah, overall it's not a bad game by any means, I'd say more just an unpolished one. Great job anyways, I could definitely see this being something really cool with a few tweaks here and there!