A bit on the easier side, but still had a fun time!
I think the tricky part for the minion spawner types of games is finding some way to avoid turning into just an autoclicker (I was mostly just spamming bats with one or two golems and that was enough to win).. One possible idea that comes to mind is having a set number of "minion slots", with larger minions taking more spots. That way you can't just spam, and need to strike a proper balance between your minions.
Overall great work!