Thanks! I probably should think more about making outlines for the sprites/just making them stand out more, thanks for the advice! I think that didn't really happen because I only developed the tile sprites a couple hours before the jam ended.
I also realized that it may be hard to tell if you were hit, so yeah - some sound effects I think would be good (also I got an electric guitar recently, so if I want to keep working on this - I could use the guitar once I've learned it enough), thanks!