It's a fun idea, when you get a game over the entire game crashes, you can fix that with a do-while loop if you coded this yourself, I'm not sure what language you used but im sure you might know what I mean, nothing stack overflow can't help with B)!
The punching mechanic is also a little bit janky, sometimes when you click at a certain spot it doesn't reach high enough, might have a problem with your screen mapping? Although it only happens after your health goes down by 1, after that it starts to kind of work, so maybe you solved that problem but only in a single if-statement and not for the rest of the program?
I think the music is bangin'
I like the whole drawn on paper theme you've got going, it might be pleasing to the eye if you remade some of the people in the drawing to look more like sketches or roughly drawn with pencil or something
Some feature that could be cool is that the hands alternate, like i press space and the right arm goes, then when i press it again the left arm goes, then it alternates like that, could make the game feel more alive, you could try adding more and more enemies as the score goes up, like "if (score > 5) go faster, add 2 enemies" or something like that.
I think this is kind of charming actually, I'll follow you to see more of your work! I hope this was somewhat helpful! I know this was just a test or throwaway to improve your skills but these were just my thoughts (:!
