I ended up quitting in zone 23. DPC was 200 and DPS was 66. I didn't really feel like clicking any more and it didn't seem like mathematically the DPS would ever be useful without grinding for cash for a really long time. Cute art though!
Balance things:
The upgrade price increases each time you upgrade something, but the 10x price is ten times the current price, so it ends up being a discount if you buy with 10x instead of buying 1x ten times. Is that intentional?
The second ally's base attack was 3 and increased by 3 with each upgrade. The third ally's was 2 and increased by 2 with each upgrade. The fourth ally's was 2 and increased by 1 with each upgrade. So there wasn't any reason to use anyone but the second, she dominated both with stats and price.