This is definitely a great game with a bright future. Even though it's in Alpha, it still has a lot of content and things to explore.
The in-game creation editor allows you to make pretty much whatever your heart desires in terms of weapons, shields, vehicles, and decorations. I was never an artsy kind of guy in terms of drawing or modeling, but it is fairly simple to figure out how to work the controls for the editor. Also, there is a small built-in tutorial along with of a bunch of help amongst the community.
There is also a build mode that allows you to place blocks and build structures. Unlike many other games of this type, it allows you to build multiple blocks at once through dragging vertically / horizontally, and offers you various shapes such as cubes, spheres, cylinders, cones, and much more. Along with this, you can also enter a free-view mode, which makes building much easier to control and look over.
I haven't played the single-player campaign to its fullest yet, but it has been nice so far. I have primarily been playing on my multiplayer server with a couple of friends, and have been creating and exploring for many hours. Personally, the game is much more fun when you have others to play with, since you can go on adventures or see what others created themselves.To server owners:
I personally prefer hosting a server from the game itself by going to Multiplayer > Host. I say this because the server controls are a bit iffy right now, and from what I understand, the "correct" way to shut down the server is to find it in the multiplayer list, select it and hit 'Delete'. With this being the case, the admin of the server is whichever character created it, and thus, they are the only ones who can do the process stated above. However, when hosting it from a .BAT file or whatnot, there is no specified character as an owner. As such, the only way I've found to shut it down is to either just exit out of it, or kill the process if using batchmode. Of course, there could be something I'm missing entirely, and I'm sure this will be refined more in the future.
I'm rambling now so I'll just start to rap this up with some of the current, noticeable issues
* Crafting currently seems to be split up between singleplayer / multiplayer, e.g there's some stuff you can apparently craft offline but not online...doesn't really affect gameplay that much though
* The camera can feel kind of unrealistic and annoying to control, but they're supposedly redoing it entirely in the next update, so we'll see
* First and third person are both options (use scroll-wheel to change between perspectives / zoom in and out)
* Entities (players, vehicles, mobs, etc) can sometimes fall through the world (primarily when in vehicles going at fast speeds for players [~100+ Km/h])
* NPCs appear to multiply in multiplayer each time the server is restarted (e.g. a town will spawn all of it's NPCs...server restarts...those NPCs spawn back, on top of another set of NPCs.)
* Their town decorations seem to do the same (some houses end up with 5 doors on top of eachother, etc)
* Along with that, objects such as turrets sometimes don't spawn in or fall through the world when spawning in in multiplayer
Over all, as many other reviews have said, this is an Alpha game. If you buy it, expect some bugs and crashes. That's why there is a notification telling you this game is in Alpha. I myself have only encountered a couple bugs in game and maybe one crash or two. However, I don't know how other people's computers will handle it and what their experience may be like. All I can say is that if you don't want to deal with bugs or possible crashes, then I'd suggest waiting a while for it to become a bit more stable and then buy it.
Currently, I'd rate it a 10/10 for an Alpha build, as it is honestly much more than I would've expected.