this game was supposed to be a simple shooter game, which (for good or bad) ended up as a semi RPG shooter game.
WASD or arrow keys to move
keys 1 to 4 to change weapon
P to pause
R reload gun
mouse click to shoot
TIP: when starting a new game. visit the base first. you can buy better guns and upgrades from the merchants there. personally i think the lasgun is the most worth-it gun you can buy at the early stages.
SPOILER: you can buy really cool guns from the NPCs in the powerplants or crashsites after you've cleared them. start out by buying a reload upgrade and a bandolier upgrade, then buy the gatlaser and stock up on ammos. once you clear any of the sites above and buy the really bad-ass weapons, the game gets really easy.
FIXED: ammo/buy bug where you lose everything you bought. sorry bout that