Finance wins games. The Banana Farm has always been important, but the BRF (Banana Research Facility) combined with the Monkey City (Village top path) allows for overpowered economies. If you want to go past round 100, you need farms.
The game breaks post round 150. Bloons become so fast and dense that standard towers will fail. You need lag as a strategy. Bloons TD 6
Bloons TD 6 is not just a single-player game anymore. Finance wins games