This game is still available for download on Vector.JP and is a space shoot-'em-up controlled by the numpad (with Shift to fire... how to screen says Space works too, but doesn't appear to in Anex86 at least) Escape doesn't pause things, instead it immediately boots you to title!

Power-ups are a sequence of colored orbs that bobble around, and each has three levels. Grabbing any other color switches your gun, so you'll want to pick up similar colors. Your ship has a single life, but several shields, although you also lose weapon power as your shields are damaged.