Game looks great, and good sound effects too!
I liked the premise, but lost pretty quickly.
Would be a nice feature to add if you get your coins back if you delete a tower, I accidentally delete my tower twice so i was very poor.
Well done :)
P.S. Unity has support for building games in WEBGL, and then games can be played in the browser. I recommend you do that for the next jam and you will get more people trying you game.