Yeah, I bought it. It's okay... I got bored of it quicker than I thought I might... probably because the core shooting mechanic just really isn't all that strong when you get right down to it.
But if you want to play a REALLY good game:
https://www.megaupload.com/?d=AJFLX0DF
That's a download link for X-Com: UFO Defense. It's a really old PC game, and also saw release on the PS1 (launch title, I think). Anyway, the whole download is only 8.5 megs, and 20 megs when you install it. But old as it is, it's one of the best games I've ever played, period.
But don't take my word for it. IGN ranked it as the #1 PC game of all time:
https://pc.ign.com/articles/772/772285p3.html