Interesting combination, but I had a hard time playing it. It seems clicking fast is really important, even more so during the defense part. As I was trying to click fast (and stressing my carpal tunnel), I kept accidentally clicking random upgrades. When I lost, I instantly clicked two following buttons and got taken to other menus. I also seem to have missed the purpose of coins because I never saw a shop (probably because I clicked through the menus too fast after the round).
Congratulations on submitting your game in time!