Interesting puzzle idea, although I found it unintuitive - it seemed like it was easy to get the game stuck if, for example, you put out the wildfire on Level 1 too early and prevented a clear path to the cabin. It could also maybe have done with things like auto-advancing turns if you had nothing else to really do.
Nonetheless, it was fun once used to it and had a lot of charming little things - the ability to rip Bernt's head off with the helicopter was a hilarious touch. Nice work!