Well, there is a lot of room for improvement here
1) Physics feel very junky, which sadly is not a good thing for a platformer game.
2) The combat mechanic also suffers - the attack sounds like a firing a laser; killing enemies is way too easy, the lack of animations makes combat not interesting.
3) I'd suggest removing HP bars, with everything dying in three hits you don't really need those.
P.S. I got an enemy stuck in the ground: https://imgur.com/a/ghgvKQu