This games main mechanic is really promising, i think you could make a bigger game with this idea. I get that theres no time for pretty art (ngl, it doesnt look so good :P). I would like to see more turrets in the game, with different abilities. Also the enemies could hurt you, when you collide with them. And you could make a tutorial, show controls, main goal and the cost of the turret. But its hard to make a fully polished game in just 2 day. So great work.
Btw, please check my game to: https://itch.io/jam/zenojam/rate/750940