Just go to the shop and buy turrets and shoot these.. circles..?
Expect TONS of bugs and glitches. this is my first time making tower defense games. If there are any bugs in my game, just tell me but I already know a bug where if you click on a specific spot, a random hull and radius circle will just appear out of nowhere. Also there are just three waves and only one tank BUT. I'm still updating them possibly weekly or when I actually have the motivation. Also don't put your tank near the entrance because for some reason, it glitches the enemies out