Really fun game, but I also got the same bug as the other guy. The wave sometimes triggers by itself, at first I thought I just accidentally clicked it. But it often reoccurs.
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Thanks! This is a valuable feedback as I can see my design mistake 🤦
Waves are actually supposed to "trigger themselves". If you look at enemies outside the circle you can see that they're slowly moving towards the circle. When they reach the bound the next wave starts.
I definitely should've communicated this more explicitly