Thank you for such a detailed comment! Everything you said here is absolutely stuff I want to do. I started the jam a day late and it's been a blitz, so I onyl got done what I could done. Mouse control is in the game (Hold down left click), it's just...a bit clunky for now haha.
I'm not sure why I decided to leave the HP amount not showing, so that's an easy fix.
I definitely want to set this up for mobile at some point.
As for art, everything but the background was basically meant to be placeholder unless time allowed otherwise (time did not allow otherwise T.T)
On the balancing thing, all the speeds used to be MUCH higher but you could get to level like 25 easily with a "lawnmower" effect on planet spins, trivializing the game. So I opted for everything to be small numbers. There is some strategy on what you pick depending on what upgrade cards come up. naturally with later additions, these will likely all feel a bit better.
Once again, thank you for such a detailed comment <3