All the authentic Halo audio you know and love. A needler sounds like a needler, a plasma grenade sounds like... You get the idea. The orchestral soundtrack is excellent too.
Better resolution and a bit more detail than its mobile counterpart. Halo: Spartan Assault looks perfectly fine, but is only really an incremental improvement.
Twin-stick shootiness that works well enough. Occasional glitches and some slightly shonky aiming mar the experience somewhat however.
You don't get all that much for your money. 30 short missions and a co-op mode are the sum total of Halo: Spartan Assault's package. Decent enough, but not exactly an embarrassment of riches.
A mixture of boring and half-decent, Spartan Assault's achievement list isn't really anything to write home about.