Being pretty much the only person on my XBL friends list (of 100) that has played Halo: Spartan Assault on not one, but two platforms (Windows 8, Windows Phone 8), I can say with certainty that the game at its current price point is a pretty safe purchase (and both are available for trial, or 6.99 to buy). They both were widely disregarded due to the exclusive (and limited) platform release. Back in September they also added Xbox 360 controller support on the Windows 8x version, which works far better than the touch interface and while a little less precise than the mouse, Spartan Assault is a dual-stick shooter and playing it on a controller feels far more natural.
While playing it, I found the lack of coop to be glaring – it sounds like Vanguard Games has taken a step up. In the upcoming release are 30+ missions and online coop. Also, the Flood were absent in the current editions, but look like they’ll be making an appearance. No word on whether the PC and Phone editions will be receiving a comparable update.
Halo: Spartan Assault is coming to Xbox Live on both the current generation Xbox 360 and the next-gen Xbox One this December.