Hi, thank you for the feedback. Happy to hear you liked the graphics and the mechanics of the game.
The 8th Planet is quite challenging I agree - the trick is to respec all points into damage.
I might implement a customizable difficulty system where you can adjust planet health/damage at the expense of score once the Jam is over.
I'm also thinking of redesigning the boss you got stuck on so that there is a gap where you can attack it freely.