Flying and shooting inside a worm

CopterFever is a game developed to CBCorner's game competition.
The idea of this game is to fly a helicopter inside a huge worm that has eaten your girlfirend. You must save her and bring her back.

The game has 5 levels and it is not hard to complete the game.
Only the start of each level is a bit difficult and in the fifth level you have to take care of an enemy who can shoot back.
It's a pity the graphics never change through the levels.

Controls:
Left mouse: keep your helicopter in the air
Right mouse: fire