It's all fun and games until the dreaded VSync bug appears and the game becomes unplayable. Basically, your FPS influences a lot of weird things in this game: With more FPS, your build times and enemy spawn rates increase around 4-6 fold. This leads to enemies killing your buildings (and doods) much faster than you can build/create them. The bug has been known for years, still not fixed. There are some work-arounds online (fiddling with the VSync ingame and the FPS options of your GPU mainly), but no permanent fixes. I tried my best, I really did. But in the end, this won't work out. Hopefully, the refund goes through.