Cool game with a classic feel.
I found myself $5 under what I needed for an early-game money drop upgrade, which I think would’ve really paid off, although I don’t know how big the increase is. That was a slight bummer. Some other upgrades I’m not sure I ever needed.
I guess you just have to learn when things are coming and make sure you save enough – at least assuming the upgrade order isn’t randomized, I didn’t check. But random would probably feel worse.