Good start overall, but balance feels off. First i had to grind copper for few dozens of runs to buy enough run time to reach diamonds and then, even when i have every non diamond upgrade, i can barely touch diamonds once every few runs. "Reduce pooling weight" upgrade doesn't help either, i bought it before i understood it's actually bad and i can't reverse it now...
Apart from that there are visual glitches when i switch tab and get back to the game (all particles scale 100x in size for a second or two), but it's a minor thing