Eraser, you would LOVE it. Put simply its everything a classic Metroid and Castlevania fan loves. Its 3d, set on a 2d side scrolling view, with some amazing visuals and so much to collect... The devs actually all spent a lot of time playing the old 2D Metroids so that they could copy the feel as best as possible and it shows.
If you get the demo of Live, heres a hint... Beat the big metal spider boss, you'll know which one it is when you see it, its just after you get the grenades. Once he starts exploding, keep pressing Start. After a few seconds it will bring up the pause menu. When it does, select "Load last save point". It loads back to the Grenade room, the boss is still beat... However, you just unlocked the full game. You can play from start to finish now. Otherwise the demo would end in that room. Only downsides are that it doesnt let you save and quit, otherwise you have to do the trick again, and you also cant get cheevos

But damn if this isn't worth the 1500 points. Probably the best Arcade game I've seen in a long time. Go give it a try.
http://www.youtube.com/watch?v=C8tRQdSwLxU