Seriously though, don't rate this down, I'm only stating an opinion. I've played through the first few levels, mainly cause I wanted the two hard badges, but I just don't like the game..at all. I really don't understand why most of you think that it's the "best' game on Kong. :p
@alecrules. That wouldn't work because you could just choose weapons like Diggers and Area Strikes and it wouldn't really be fair..or fun for that matter. Mainly because there's a Firing Range for stuff like that if you want to test a weapon.
To add more stars to your count in the one launch, continuing from what tcdc explained, you can also use "rainbow Stars" to get many more stars in your one go through. Hope this helps. + so others can see.
@ermns. You have to go to the upgrade screen and find the mana upgrade, which is right next to the shield on te top of the screen. Then just upgrade it.