Plushie Defense

I made a tower defense game where you have to defend the teddy bears from the enemies because plushies is the first thing that comes to my mind when thinking about soft things :)Cool thing is that you are able to see the enemies path before the round starts (randomly generated from 8 possible paths)I was planning to make a turret upgrade system and a exp system that gave you some global upgrades that changed how some turrets worked (slowing turret giving poison and so on) but I wasnt able to do ...