Dead Space and others 49 cents
Android appears to be having a sale to promote their updated "Google Play" store. There's quite a few apps on sale for under 50 cents including Dead Space, Osmos, Cut the Rope, and I thought world of Goo was on sale, but I don't see it anymore.
Dead Space controls shockingly well and not just tolerable, but it's possible that I haven't played it enough. The others I mentioned are good too, but Dead Space is normally something like 10 dollars, and I figured that warranted the most attention.