Did you like Geometry Wars? You did? Lovely, then you don't need to play this.
Pulstar is a ♥♥♥ for tat recreation of the original Geometry Wars, including the original GW's dearth of mode types. You have one basic mode, and that mode can be played with a friend via local co-op, so it has that going for it. Unfortunately, it doesn't play quite as well as GW, due mostly in part to it's graphic style. If you've ever stared into a bright screen in a dark room only to look away to find a stray Cheeto that fell to the floor, then you have an idea of what it's like to play Pulstar. Thanks to the ultra-bright sun in the middle of the screen and your own flashy visage and shots, you can barely see the dark enemies against the dark blue background.
And that's...pretty much it. The enemies are difficult to see about 3 minutes in, when the game starts to throw all three
enemy types at you as fast as it can. You'll die soon after that. I got my highest scores when I just stayed in the middle, swirling the right thumbstick on my gamepad. Any attempt to do otherwise would see me swarmed by the beasties in a matter of moments.
There is absolutely no reason to play this over the majority of other similar twin-stick shooters. Your several minutes time is better wasted petitioning for GW2 to come to steam.