Thanks for the comments guys.
In the post comp version, I fixed the issue with being able to go towards the teleport first (also, an "issue" where you could get double jump before red shard, which also wasn't intended).
As for why destroying the fracture would reunite the worlds, it was intended that the source of the fracture (the boss) was the one who was holding them separate, and without his interference, they would reunite. Not really explained in game, but the focus wasn't on the story.
I think I'm going to change the turrets to have to kill them only once in each universe.
As for the constantly respawning on that snail, it seems a lot of people enter the room in a way that causes that to happen, which I didn't forsee. Fortunately I was able to fix that kind of issue in the post comp version. I've also added saving and loading (in addition to a harder mode). Hopefully I should be able to finish that soon.
And thanks again for the comments, it's definitely help me to tweak the new version. :)