The ability to scale the main character.

[Triple J]

I think it would be neat if the player could be shrunk or enlarged, though I don't know how the physics would work out.

Some ideas using this:

• Gradually shrinking the player until you're gone/dead. This would probably require it being a trigger function to scale the player.
• The level feels bigger or smaller to the main character.
• If jumping height and running speed are adjusted to your changed size, then this could be either a power-up or a power-down.
• Small spaces could now be entered, or tall cliffs "scaled."
• A fat or skinny player (I either ate too much or starved). I know, it sounds stupid.