This was much fun to play, I had a good time with it.
The overall gameplay is very engaging and yet simple to play around with. The art style fits the game same with the audio design. It is maybe a bit difficult without much of the player getting more powerful at all. So I do think more upgrades are a much needed change as it will help the progression and maybe allow for different builds. I do like the current upgrades, they are all unique. But I do wish they were binded to something else(personal pref).
I also feel like if the power ups are only once per round then some other progression system is definitely needed.
Apart from that I don't have much to critique on, just the base progression.
Amazing Work Overall!