20 days to beat is a little crazy imo. I had the borders all offensive girls, and the middle all melon girls with all upgrades by the end of night 8. I have 5 million gold by day 12 with nothing else to spend it on and there just simply isn't enough variation to incentivize staring at the game for another 8 days. Also the projectile flying slightly above where your cursor is becomes far more irritating as the days pass by.