Pretty cool game and well made. Have to agree with others that the Jam theme seems a bit lacking, saw your comment about that and thought it sounded interesting.
Only thing i will say is the controls feel akward, though this is just my opinion (wasd over arrow keys for movement feels more natural imo).
It caused me to grab a controller, and i noticed that controller support was present, but oddly it had slight small bit of latency compared to keyboard, but the game's difficulty isn't intense enough to make that an issue.
Really enjoy the character style, and it's very impressive for the time frame it was made in.