Each level has a different mission objective.
The first level. Enemies can be seen as yellow dots on the scanner in the right corner.
Firing at one of the targets I'm supposed to destroy.
Picking up some extra (life)energy.
Using a smart-bomb to kill all enemies on the screen at once.
The first boss. It's almost impossible to see it, because it looks just like the background...
The boss flashes when fired at. Now you can see how it looks like a bit better...
In the shops, you can buy better weapons, increase your speed, or get other improvements for your ship.
Killing an insect with my new rocket-weapon.
Surrounded by hostile spheres, in some kind of volcanic environment.
Firing at some kind of hatch, to reveal the secret tunnel underneath.
When you enter a tunnel, the game suddenly changes into a side-scroller.
When fighting this boss, the game changes perspective again. Now you look at your ship from behind (ship is seen to the left).
Now a whole level is played side-scrolling.
Some kind of giant snake...
Fire-fight with a huge boss at the end of the level.