It costs 61p. How could you possibly NOT?
Frankly, even not having an Xbox 360 is only a borderline excuse.
Roboboobies aside, Shoot 1Up (which is how the Queen says it) is actually a pretty fun game, built around a very interesting concept where you have all your ships onscreen at once and either contract or expand their formation to avoid enemy fire/use your super-laser weapon. It's full of ideas, there are giant explosions, and at 80 Microsoft points it's in fact a fraction under 61p. Truly, we live in extraordinary times for fan of inventive independent videogames on consoles.
It's the best Xbox Indie game this reporter's played since the mighty Squid Yes! Not So Octopus!, and you'd need to be some sort of churlish idiot not to take a look. Go now.
(PS There are still some free full-version codes of the latter, pictured above, available to WoS subscribers.)