First, I'll tell you how to Not have your Game crash when you try to edit your 2.2 level, Why does this happen? Because of the Middleground, Leave that feature alone and the level wont crash.

In the level you can use camera features like using them to guide or offset the players camera, you know how the camera rotates a lot in dash? thats by using the "Rotate" Camera Trigger. And For the effects, you can leave them alone to start a effect and set the "Target" to 0.000 or whatever to end the effect. This guide seems Useless and boring, right? well, now we are About to get into The Juice. and yes Im showing a screenshot of what camera and filter effects can do.

You choose which to use, go to the "Classic" section for classic mode and "Platformer" for platformer mode.

Okay, I get it, you wanna be all "New" and "Popular". But Sure, I'll tell you how: Just wing it, sorry im lazy :P

Ah, Old school, If you like the whole "turn around" idea, Use reverse trigger and bam, and for the design, use something that works :)

Good job! Now you can make a good 2.2 level! Thanks for reading :D