In order for you to play Tower of Guns on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Any linux distribution since 2010
Processor (CPU):
2.4 GHz Intel Core 2 Duo (Dual-Core)
Memory (RAM):
3 GB RAM
Graphics Card:
NVidia Geforce 275 GTX +512mb memory
Storage:
2 GB available space