That style of power up system always frustrates me - similar to TwinBee with the bells. Been playing a bit of 1943 kai as well in my PCE GT, but I think I'm going to need a proper sized screen to make any progress.
Yeah I can beat the OG stages w/o dying but when you get the power up for the new stages its chaos to say the least. I fucking fumble ass around trying to shoot the right icon I want. I'm guessing the laser is the most powerful in the game and its a bitch to shoot enough times w/o the enemy planes slamming into me lol. On the arcade port the powered up shotgun owns this game big time. The way this game is programmed all other weapons seem to be shit weak except the laser which is stupid imo. I guess I need to roll the sleeve's up for this one.