Thanks for trying the game. The idea behind focusing on the base below is to have an excuse to upgrade the length of the rope, as well as the distance of the projectiles. Otherwise, it becomes unbalanced, both because there wouldn't be much point in collecting the green materials, and because once you reach triple fire, you just need to spam to destroy the enemies before they appear. Regarding the zip file, I used the self-extracting option of 7zip, I didn't rename it. Thanks so much for your feedback.