Fully automated (at first, you unlock commands) battle serpentine war machine that plays a bit like a match 3 where 3 of the same color will upgrade that part. Each part does something different like shoot lasers, flamethrower, or send out heal drones. The item for sale via IAP is also obtainable after destroying objective structures and is used to buff up the armor of your parts or quickly unlock upgrades. The game leaves figuring out what each part does up to you and what colors can be combined. Overall, it feels like watching live news on the TV of an alien invasion with a semi-casual game tucked in. It does look and sound good. Need to play more to get a better feel.