Controls:
W, A, S, D - to move
LMB - to shoot
E - to interact
1, 2 - to use items
ESC - to quit
Kill aliens for better score. Without oxygen you will lose health, so you will have to collect oxygen bottles dropped by enemies or interact with oxygen bottle found on map (bottle will be empty after you use it 4 times, but it will refill after some time). Also use battery dropped by enemies to recharge weapon faster or just wait some time. Heal by collecting and using health pack dropped by enemies.