Interesting idea! I reached wave 7 and had no money left - only had the chopper and I probably couldn't fend off al the fires. I wasn't sure how to earn more money, if it's even possible?
The controls took some getting used to - for example, for shutdown camp - the circle wasn't super obvious. In general, there seem to be some internal "state" of the current action that is not very visible, and so you click on things without realizing what they do
I think a more obvious way to make money would allow the player to experiment more and get used to all the actions and what they do. I never seen a forest fire sim and the idea is really interesting! Would love to see this one developed