Pretty cool game, quite addicting, but i have some things that could improve it:
1. I know that you didn't have time for a tutorial, but at least just a screen with the basic controls would have been a more finished game.
2. I didn't really understand what the bar on top of a character means, because most of the time i could just kill them with one hit.
3. How do you get coins? Maybe write stuff like that in the description also.
4. I personally think the font is pretty generic, maybe change it.
But other than that, really cool game, congrats that you managed to make this in only 3 days.
I hope my feedback helped you, it would be really cool if you could check out my submission too. :)