sadly the controls don't really work on keyboard (don't know about controller), A-Key does not move the character to the left, which would be fine since you can use arrow keys as well, the issue with that being that jump is on spacebar and attack is on leftclick, so you would basically need 3 hands to be able to use all actions comfortably (you can't really use spacebar with the same hand you use for arrow keys, same going for leftclick).
if you want some input, i would just use arrow keys for movement and map actions (jump, attack) to c and x or j and k which is pretty common for this type of game.
overall it looks really good, plays pretty smoothely but has issues with the controls as mentioned above.