The game is 7 pages long so don't expect a lot of material. But still, there's everything you need : from character to creation to equipement with a setting and stats for 4 different types of Bugs.
The rule are quite easy : 2D6 + Skill vs TN
The adventure is straightforward as well but it just works very well. You can download the game, read it and play it 15 minutes later. You could have a 3 to 4 hours game session just for 1$.
If you want to run a quick and dirty Starship Troopers/Aliens game, you can't go wrong with this game.