I really enjoy when games that tend to be more passive, like tower defense, have an active component. Something the player can engage with during some of the more automated parts of the game. So I was intrigued by a painting the battlefield mechanic. I unfortunately could not figure out how to get the green paint down, perhaps I was missing something or there was some hidden bug? I bought the necessary upgrade I think. Seems like there is a lot of interesting design space to further explore there!
I simply spammed units until I hit the unit limit or whatever there seems to be. I wasn't sure what the green tower exactly did. Reached the boss, it started to fade out, but I had no more moneys and it stomped all over my poor tower.
Had fun. Neat idea. Keep up the great work!