Early access. Do not buy unless you have intentions of helping it along. They do not mention the cash shop available on their website, with a limited selection of items to 'help' along players and there are more options for different packs to invest in the game (Ala Kickstarter type stuff.)
Edit 2 - The game is clearly also 'Pay to win' right now. The more money you invest into the game is going to net you better gear, which makes it easier for you to hunt mobs and make PvP a simple matter of holding your gun straight at an enemy and holding the mouse button for a split second until they crumple under your overwhelming DPS. To give a comparison, the starting gun has a stated 16 DPS - The gun you can buy in a bundle has 300+dps, and you have a meager starting 50hp. None of the armor seems to reduce damage by any tangible amount either.
To make it even worse, safe areas are not clearly designated or noted, and so you don't even know if you're even capable of defending yourself or being annihilated until you trade shots, and then you just sit there daring the other person to leave whatever safe area you've found so you, or they, can shoot each other in the back.
Edit 3 - Game seems pretty stable if lacking in graphical options. Zero ability to adjust any graphical options at all and I couldn't find any to adjust in the files. Everything you build can be destroyed while you are offline, including the stuff you've bought in the bundles, and there isn't a damn thing you can do about it. If you lose your ILU (Basically your transport unit until they add more stuff for it) while you are offline and log back in, you are effectively stuck on the planet until you suicide into bugs. Hopefully you killed a bunch of stuff with that bundle you bought (You bought it, right? Hope you like doing zero damage and getting ganked all day if you didn't) because if you didn't, you'll be starting over from nearly ground zero. Re-grind for money to get another ILU to transport yourself to another planet only for it to be destroyed the next time you log off.
ANYTHING YOU BUILD CAN BE DESTROYED WHILE YOU ARE OFFLINE. It is INCREDIBLY easy to do this. This wouldn't be such a huge issue if you weren't transported to another planet and dropped next to two to three other players ILU's, of which you can shoot if you want. You can also damage your own if you shoot it. The basic turrets provided to all ILU's only fire at mobs and not players regardless if you're being fired at or not.
Edit 4 5/3/14 - PvP protection has been enabled on the first planet for all players. It's an entirely Co-op experience until you get your first ILU and get off planet and into another. No more camping complete newbies. Safe areas are labeled with a (SAFE AREA) in safe areas, but you still don't know when you're near one (The only safe area I know of now is the entire first planet.) Game is significantly more playable now because of the change.
**I will continue to update this review as the game fixes it's initial problems. I'm in for the long haul in this one.**