A warning sign on cliffs

[ghost]

Hi, I was playing this game again.
And I thought, in relation to the other issue I filed, We should add some pixel art signs.

On a select few cliffs we should show signs that have a warning on them, so that players will know not to fall down.

This might seem to nerf the challenge a bit. however the only reason one should fall off in a level is because they mistimed a jump, not because they couldn't see.