The game is very fun but I play it with my cousin a lot and it has gotten a little bit boring to only place towers as the monkey.
I think to improve the game, you could make a way for the monkey to save up money and become a monkey that can move and attack. This way, you can still move around and place towers, but you can also buy upgrades for yourself such as extra speed, higher projectile speed, throwing darts, a dartling gun, a hand held cannon (could make you move slower but deal extra damage), and possibly even magic attacks.
If this is possible, I would love to see it put into the game but even if it is not, I still enjoy the game. Thank you for all the hard work put into the game.