That command has saved me from a good trouble.
I've even made it to the third power-up that turns him into a slimy ball that climbs walls (Which makes it much more accessible).
But the problem is that it uses the same left control button, and if I press the jump key, it accidentally takes me to the command to return to the starting point of the game. The command or the power up, should change its input to Z, X or Alt buttons.
The way to get the third power-up wasn't very easy, and some small sections would have to be redesigned to make it a bit easier.
And there are even elevators that lack a return button to go back up. Like this example:
Because of things like this, I barely have two pieces left that are practically inaccessible.