Rogue Tower play online

In each level, you are dropped on an unfamiliar planet, you need to constantly explore the terrain, build structure and defense towers to against the unknown creatures, and gain upgrades. Choose your way forward and upgrades wisely, or you'll have to start from zero when failed. Each game has completely random tiles, buildings, towers, and monsters.
After exploring the planet you can colonize it, build buildings on the planet, and produce ships,research technology.