It's a fairly simple vertical shooter, in my eyes it's a mix of Raiden and Solar Striker (An old Gameboy Game, which accounts for the art style). I originally started on just the graphics to improve my spriting abilities by using a limited color count, 4 in this case (Not counting enemy bullets). It worked out quite well in that regard.
The game has one fully working level (I had more, but lost them in an earlier saving error) with a basic boss that has multiple forms on higher difficulties. There's ~13 different enemy types, most having slightly different routines depending on difficulty. The game only has one weapon type, but it can be upgraded 3 times (P Capsules).
Shift - Fire
Enter - Title Screen Menu
Arrows - Move ship
1,2,3 - Change difficulty (In game)
Pretty sure the + and - keys switch bonus ships (There's only one I think) which have their own firing patterns. (Only do this once for right now!)
Forgot to mention this! If you hold the fire button, you won't fire as fast as if you "pulse" it. Press the fire button, let it shoot; let go of the button. Trust me, you'll fire a lot faster if you do this.
Provided I can sort through this MMF2->Flash transition, I should update this game within the month.