Very simple, but strangely compelling. I really enjoyed how dying made you feel more powerful; it might not be the most original way of using the topic but damn it makes for good casual play that helps weaker players more. I also really liked how the weakest enemies became more and more threatening as you became more powerful; that was a lovely bit of balancing.
In terms of recommendations, I guess it really comes down to the things hardest to implement in a 3 day game jam: more interesting art and greater variety. But hey, I imagine if you plan to further develop this game you've got plenty of ideas of how to make those aspects more interesting.
Very well done!