In-Game SOULs: Red SOUL (C) Average SOUL. Arrow keys to move, X to slow down. Blue SOUL (V) Uses gravity. Green SOUL (B) Has a spear that allows you to block attacks, but doesn't let you move. Yellow SOUL (N) Fires bullets by pressing Z. Purple SOUL (M) Only lets you move along 3 strings. Red|Blue SOUL (F) Red SOUL, but it's split into two bits. Red one uses arrows keys, Blue one uses WASD. (WARNING: CURRENTLY HAS A GLITCH!) Custom SOULs: Teleport SOUL (G) Teleport by pressing Z. Rotate SOUL (H) Moves are mirrored (up arrow key makes you normally go down) and you rotate by pressing left and right arrows. (WARNING: CURRENTLY HAS A GLITCH!)
Credits to Toby Fox for Undertale