Not much here. You walk around, use the shooty, and nothing else.

Here are some tips:

  1. I recommend playing with sound on, there's some neat tracks I put in here.
  2. To beat the second boss, shoot its spinning orb.
  3. To beat the third, fifth and final boss, destroy the green orbs.
  4. This game is really difficult. I mean,  REALLY difficult. Only through unwavering dedication and perseverance will you beat it.