Works really well with a gamepad, I noticed you even have the in game instructions auto change, nice touch! Good music too. Here is some feedback for you...
- gravity feels about twice what it should be. this contributes to the platforming being frustrating
- there is a weird bug when you attack, it puts effects in the place of the last thing you damaged
- the screen turning red can be a good way to indicate health, but it really only works if it refills quickly, otherwise the player ends up with a reddish screen. even after i died it didnt refill
- i dont think you need lives for the player for this type of game, just let them try as much as then need.