WASD — move  ·  SPACE — ski  ·  RMB or SHIFT — jetpack  ·  LEFT CLICK — fire disc
1 — Disc (cancel)  ·  4 — Radar (2000)  ·  5 — Plasma (1000)  ·  6 — Mortar (2000)  ·  7 — ELF (1000)  ·  8 — Shield (500)
Select call-in with number key, then LEFT CLICK to throw smoke & drop from orbit

Defend the generator. Kill enemies for points. Survive as many waves as you can.