Songs that I identified: "Inno di Potere Operaio - Stato e Padroni" (Italian version)" and "A Las Barricadas" (Spanish version), there's more but I don't know exactly which ones. All of them are variations based on "Warszawianka 1905" (Polish version).
On the left there's infinite people with guns, cars and tanks. On the right we have a lazy guy with a rocket laucher and some boxes. Yup, I can really see why they are willing to throw away their lives to cross that wall.
Good game, nice soundtrack, and lots and lots of spaceships firing lasers. Although I would had liked to see some upgrades, leaving it simple made it better. We are too used to see "racial traits" and "skill points" that some times we forget a game could go without those. 5/5