Infinite health
Pause the game and quickly press Up, Right, Down, Up, Left, Down, Right, Left. If you entered the code correctly, you will hear a sound.

Infinite scrap
Pause the game and quickly press Down(2), Left ,Up(2), Right, Up, Down. If you entered the code correctly, you will hear a sound.

Big head mode
Pause the game and quickly press Up, Down(2), Up, Right(2), Left, Right. If you entered the code correctly, you will hear a sound.