Very cool aesthetics, great music and fun gameplay. I think a different control scheme would help a lot with the gameplay. As SRWGShinyo, said Using Enter as the attack button can get a bit tricky, since you have to either move your fingers from the Space Bar, or from the directional arrows to press it. For a platformer game like this, which requires fast reflexes having the Jump and the Attack buttons as close as possible (Z and X, or A and S, for example) can be very helpful.