The amount of effort that has been put into developing, editing and perfecting this near-total conversion is staggering. I highly recommend trying it with a group inclined towards traditional "wargaming" tabletop; I imagine a full party platoon of soldiers (6+) could be a very unique and engaging experience within Planet FIST.
There are a couple of bits I've specified within the dedicated playtest feedback form which could do with polishing, but nothing major - this is a well-written, special tabletop game from an established, experienced indie developer, and it shows throughout. Full marks across the board.