Yep I'm planning to make airships easier to make in future. The difficulty slider does affect the size. Maybe use walls and castles first?
castles are also pretty difficult to get before the first wave, maybe the first wave should be delayed a few more minutes.
Thanks for responding btw, I really like this game and I see a lot of potential.
Thanks! I appreciate knowing how the game is played by others, helps to figure out balancing and that. :)