RuleShift: The Last Core

Protect the Energy Core from endless waves of monsters in a world where physics and logic are unstable. Every 20 seconds, the system initiates a Rule Shift—a random modification of the game's fundamental laws.

You will have to fight in total darkness, adapt to inverted controls, and survive lethal acid rain. But if luck is on your side, you will may attain the power of the Thunder God, crushing your enemies with lightning strikes and triple strength.

You may not encounter all Rule Shifts on your first playthrough, so you might want to play again :).

Controls: WASD, LMB, ESC.