@vetsin, did you try multiple times? I suspect -O3 flag while compiling is giving me some random instabilities. A friend also told me towers won't construct on his Android like they should, maybe after tapping 10-15 times on the same place. Has anyone else had this?

@skate_boy92, try using the DEB, and as ade said, use sudo apt-get -f install

@Russe89, thank you for your suggestions! I know the game should be longer, and some kind of infinite mode would be awesome, but I didn't have the time to implement it, as it would require a substantial ammount of tweaking and balancing. In the short term, I'll probably make more levels, and I guess some kind of "hard mode" is doable, I'll consider it. I'd also love to make massive epic battles, but such a thing would be prohibitively expensive performance-wise. More enemies and more towers quickly eat up CPU and GPU on mobiles, so there were some painful compromises to make.

Once again, thank you all for your feedback!