Nice little platformer you've got here :)
The visuals are nice and engaging and I really like the checkpoints and infinite lives, so I can try and fail as much as I want ^^
I think the camera always centered on the character makes your surrounding hard to read when you move. The fact that it's so zoomed in also force you to have a lot of "leap of faith" where you jump without seeing where you will land, which is a big problem for a platformer (unless you want to force your player to do something specific to know where they will land)
I would say the attack lacks a bit of range and/or duration, I've got killed several time because I attacked an enemy just a bit too early or just a bit too late which was frustrating.
Good job for all the work!