maybe add a mechanic where once they are all maxed, you start a separate upgrade process that sends them into the opposite direction and creates energy due to the friction, and could be spent on something else?
Very easy to get to 10k score in my honest opinion, maybe add different enemies that are more annoying and make you maneuver. Upgrade menu is sweet. The whole time while i was shooting at everything, I felt like there could have been more color other than dull grey bullets flying everywhere. Maybe add bosses incrementally, i.e every 2500 points, I did all 4 bosses back to back.
Honestly, i thought the game was too easy. i think you could put a harder difficulty after you beat the game so i can go back and play again. It was a really fun game and i can't get enough of it. keep making these great games and keep having fun with them! 5/5
 "Groundhog Life"){kind=icon}
 "Psyclotron Idle"){kind=icon}
 "Revolution Idle 2"){kind=icon}
 "PewPewEmUp"){kind=icon}
 "Trollface Launch"){kind=icon}
 "Burrito Bison Revenge"){kind=icon}
 "You da Fly"){kind=icon}
 "Upgrade Complete 2"){kind=icon}
 "Snailiad"){kind=icon}
 "Anti-Idle: The Game"){kind=icon}
 "Memoir Text Adventure"){kind=icon}
 "Zombie Trailer Park"){kind=icon}
 "Demons Took My Daughter"){kind=icon}
 "Feed the King"){kind=icon}
 "Epic Combo!"){kind=icon}
 "GemCraft chapter 0"){kind=icon}
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Working on a new version that focussus more on movement :)