Intrusion 2 [official site] is an exercise in escalation. You begin as a soldier with a laser pistol fighting other men with laser pistols. Then there are multi-pronged snake beasts whose arms pluck you out of the air. Then there are men with laser machineguns. Then the men are riding wolves. Then you can ride the wolves. Then you are fighting mechs with swords. Then you can pilot the mechs with swords. Then there’s a helicopter with arms. Then you’re sliding down a mountain using the helicopter’s cockpit as a snowboard while fighting robot snakes that are busting out of the ground from underneath the snow.
This is, like, the game’s first hour.