Loads of colors, madness, fun, randomness, deaths, fun, pixels, projectiles, fun, points, tracks, fun.
Here is how to describe it. An indie casual shooter, where your goal is to survive the longer possible while travelling at faster and slower speed in the endless space with your ship, while tons of random things may happen (from sudden endless battalions of ships, to floating jurassic bones that can shoot from their mouth).
The controls are pretty simple, though the game lacks of a tutorial to explain what your ship can do (become a drill to enter inside asteroids or planets and other kind of stuff, move at extremely fast speed to create a super-lethal ring of fire around your ship, channel a limit break of your ship while you collect shiny thinghies, or charge your projectiles just to make them bigger). The options don't allow most of these controls to be changed, but their key bindings are pretty good and not really needed to be changed.
There are also upgrades you can buy after every death you score, but careful that by buying them you make the next tries more difficult than your previous. Also, it may happen that you won't know what are you upgrading at first, but by playing again and again the game you will understand their use.
I don't really think there's a local coop in, but the singleplayer is good enough thanks to it's replayability to make this game a good choice for bored people.