This game is a mix between first-person shooter, tower-defense, and sandbox-survival. This game is Minecaft with a Sanctum twist.
The game is as visually pleasing as it is fluid in movement. You have the parkour abilities necessary to climb almost anything, which makes the game a whole lot more interesting. You can wall-run and shoot down aliens that are attacking you and your base. The game is also very physics oriented which means destroying something from the base topples the entire structure.
So far I have only seen 3 aliens, but there might be more, since the game seems to be infinitely-generated. There are 2 weapons for the player to use, a pistol (which you start with) and an assault rifle. As for defending your 'Eden Kit' (which is your life-support), you can craft 4 (or 5, I can't remember) defensive structures. The game also has basic parts for making a base. On that note, building in this game works very well, I was able to adjust the orientation of everything I placed to whatever I needed.
From what I have read on the forums' this dev-team only releases updates when they are certain it is as far developed as possible, which makes for a far better play experience compared to indie titles that release buggier updates and simply fix them over time.
All-in-all this is an incredible title, all it is missing (in my opinion) is a multiplayer, which would make this one of my top 10 favorite games. I definitely recommend buying, and playing, this game!