Like every tower defense game, you have to prevent critters that come in waves from reaching your base. To do that, you must deploy towers along the path to kill'em all.
There are four types of towers you can use:
- Blaster tower: simple cannon tower, shoots fast and initially weak bullets
- Laser tower: makes damage over time and hits every critter aligned with the laser
- Missile tower: shoots slow missiles that follow a critter and do lots of damage over an area
- Shock tower: doesn't do damage but slows critters down
You can upgrade every tower by selecting them and clicking on the upgrade icon (up arrow).