The amount of token you need to get feels a little low, once you got a 2nd cannon and all money multiplier you're pretty much done with the prestige upgrades, the rest only help a little bit.
the passive income upgrade is also feels kinda useless, by the time you get it to a high level you can already get tons of money from just starting another round (unless you can get the passive income offline then I guess it still have a bit of use)
other than that the game was fun, would def be interested in playing more when there's more upgrades to buy!