I decided to add some extra things and admittedly don’t like the bouncing mushrooms because they’re wonky. Buuut, I played around with ladders, disabled shooting to make enemies into more of a threatening hazard, and added a green variant of the blob enemy which moves twice as fast. Water also causes you to slow down and hampers jumping ability! The player is introduced to water in the first few seconds of level one, and they have to climb back out of it so they know ahead of time what it does and what its dangers may be.
That’s the operating assumption, anyway.
Also the player is 100% in the wrong starting position, but that’s because this screenshot was taken during testing runs.