Well if your going to make a space shooter I would recommend insted of using power up's design it like the game IKARUGA.
IKARUGA is a Gamecube game which is old school 2d but with a very 3d backround which has unbelievable gfx.
I know this game gfx are not possible on a pocket pc but how IKARUGA works is your a ship ( duh), and you have a shoot button , missle button , and black/white swich button. There are know powerup's at all. There are 2 types of enemys ( no more no less) , black enemys and white enemys. Ok now how the game work's is if your space ship is Black and you get hit by a black lazer you get power , if you get hit by a white lazer when your black you die. If you get hit by a white lazer when your white you get power , and if your white and get hit by a black lazer you die.
You also have a little bar on the side of your screen were you see how much "power" you have and when you press the missle button you use all of that power for a super lazer missle attack. The more power the more missles and power comes out. ( Also it shows how much life and heath you have left , heath is done in 3 bars , so you can only take 3 hits).
You also have a basic double lazer gun.
Another thing is when your white and you attack a black enemy it does double the damage , if your white and attack a white enemy it does normal damage. If your black and your attack a white enemy it does double the damage , if you attack a black enemy while your black it does normal damage.
At the end of each level there is a boss which will swich from black to white every few moments which becomes very VERY tricky. This game is one of the best games for GC at the moment but the only prob alot of people have a hard time with the game since it is so hard. Im talking like impossible at level easy.
