The final powerup was very satisfying. Well done.
I know the time restraint was a huge limiting factor, so take these suggestions as potentially something to add in the future if you work on it any more.
Make the punch animation snappier, especially after the final powerup, and make it animate in the direction you punch. As it is, it's hard to tell that the direction you click is important for hitting enemies.
Add a chunky punch sound effect on final powerup. Would be oh so satisfying.
I think I won? I couldn't find anymore enemies after a certain time, but I don't know if it was meant to be endless or not, some sort of indication if it's not meant to be endless could help.
The zoom out effect felt unnecessary to me and made it hard to tell who was who. Just tuning it down so it doesn't zoom out quite as far would probably be enough.
I enjoyed it, keep up the good work!