It's a good game. The only things that I would love to see improved is:
- Better idling (should run in the background or accumulate some offline-progress)
- Have idling be less strong (when you let the game idle it gives out 100% rewards, which allows for a ton of upgrades when you leave it running for an hour). If idle progress was capped, it would feel better, I think.
- There should be some easier way to upgrade. How about some button that buys the cheapest upgrade for you and a button that does that 10 times. This would make it easier to get the ton of super cheap upgrades each prestige.