Great job on the game, I have just 2 comments.
1 - No idea how to actually perform the kick
2 - In both full screen and windowed mode, there's a ton of sprite tearing. Misaligned pixels on sprites, text, etc. I'm assuming the game is trying to draw outside of the standard pixel grid and this is happening. Sometimes it's extremely severe and I have a standard monitor resolution (1920 x 1080). For example, sometimes the leftmost pixels on X's leg will jump 1 space to the left leaving a gap