There's 75 levels for you to master, though if you manage to complete them all, you start again from the beginning, but everything will go a little bit faster. The level you're on determines the points you get for each pod you collect, the only exception to this is the even numbered levels, these pods are green and are worth 75 points regardless of the level.
If a rocket hits you during a level, you will lose a life, except on green pod levels. On those levels, you simply get transported to the next level without losing a life. An extra life is given when you reach levels 25,50 and 75.
This game has been tested on phones and tablets, and works on both types.