A very interesting game! My playthrough went like this:
1m: what the heck does "check height" do? it always just shows 0 or 1
2m: i don't get it, but my random spam seems to be working
3m: OHH! you can stack on top!! that's clever!
4m: why don't i just stack all the same pieces on top of each other, then i don't have to think...
5m: i have an organized chaos of huge towers of the same piece, i'm unstoppable
6m: i'm rich
7m: oh no, the "pesky circles" are getting stronger... my towers will slowly fall...
8m: my king!! not like this!!
9m: oh wait, new towers crush circles?? SPAM CLICK AGAIN
10m: the circles may have destroyed my city, but we emerge victorious. hurray!!!
I quite enjoyed the progression of gameplay, even if it may not be what you intended... haha
I think the tower stacking mechanic could be really interesting in a puzzle context as well! Thanks for the game