No story, no chapters, ONE map only. The only purpose is to survive as long as possible.
For starter, you have limited 24 tiles (named TurretBased) to build on, and you can buy more tiles later. It's a normal idea until the price increases dramatically after every purchase. The first tile is 20$, but the tenth one is 320$. You'll end up with a tiny base in the middle of a huge map.
About the resources management, the idea of juggling between different kinds of resources is good, but again the dev somehow ruined it. The game has 2 basic resources: electricity (provided by PowerStation) & mineral (provided by MineralRefinery). In theory, one PowerStation can individually supply electricity for 5 turrets, and one MineralRefinery can individually supply mineral for 5 turrets. HOWERVER, if you build one PowerStation and one MineralRefinery, together they can only supply for ONE turret. Why? Because one PowerStation consumes 90% mineral that a MineralRefinery can supply, and vice versa. So every time you want to build a turret, you have to build a PowerStation and a MineralRefinery.
The game has 2 basic resources: electricity (provided by PowerStation) & mineral (provided by MineralRefinery). In theory, one PowerStation can individually supply electricity for 5 turrets, and one MineralRefinery can individually supply mineral for 5 turrets. HOWERVER, if you build one PowerStation and one MineralRefinery, together they can only supply for ONE turret. Why? Because one PowerStation consumes 90% mineral that a MineralRefinery can supply, and vice versa. So every time you want to build a turret, you have to build a PowerStation and a MineralRefinery.