I haven't played it in a bit although when I did there were no levels. When I played no single player either. The online matches allow you to play with random strangers or friends, your choice (Private Rooms). The game play scales with 2 resources, energy and mex or mass or something (idk). Anyways you are constantly gaining these resources and constantly spending them as structures use energy and factories use both. You can change what your commander looks like and there is some cool gamemodes such as the one where you can control your allies unit (Recommend only with friends or trusted people). You start off with only being able to build basic factories that your commander guy can make. Normally you start off by making Fabbers (Engineers) to build stuff. The type of factories are land, air, sea and bots (Robots). Each Fabber can make a better factory of that tier EG. T1 can make T2 and T2 can make better structures. The main part of the game is to set up a good defence with your base with a variety of turrets and you can build walls and units to also defend or attack, there is also artillery. You can also go to other planets if the host makes some in the solar system. You can check each planet for how many hallies (Thrusters) you need to push it. The planets can be pushed into other planets. Or you can use them to gain even more mex to build more stuff. Anyways, I don't find it that fun without friends personally but I do know several people who do. It's up to you though, Hope I helped.
