Good fun and really brought the the old school Gamecube kind of feel (as well as Half life / Team fortress). I would like to have made it further as mentioned some of the enemy AI and placement was punishing. It would have been cooler to have some additional train carriages at the start (i looked for them - or explanation if single was intended). I think this would only add to the strong start and perhaps you could hide an better gun for explorer types :)