Okay, now I've gotten ending 2 too.
Finally done.
That room was actually pretty chill, only making the intial wall jump into you are up on the right most platform.
After that it's chill.
For my taste the bottom room end death zone could have jsut been a tile further below, giving you a bit more time to react.
But it was still possible, jsut a matter of trial and error and button mashing :-)
Gotten all 4 endings, my live is fulfilled.
Never would have found ending 4 by myself though, only freak accident helped me get it out of nowhere :-)