If that didn't draw you in, I don't know what would have...

Anyway, I am near the end of this game and I accidentally found a repeatable "warp" in the Glacial Tomb area which, if not already known, would likely be interesting to anyone trying to break the game.

The room where it takes place is 2 rooms to the left of the save room - the one with 2 Tracer enemies.

Kill the enemies to get them out of your hair, then position yourself just on the right hand side of the crevice that you must slide to get through.

You want to be almost pushed as far left as you can push against the wall but not quite - where you really want to be is, pushed as far left as you can against the totally straight up+down part of the wall that you can push against while jumping - again, not even further left where the wall bends in toward the crevice.

From this spot, facing left, double jump straight up, then down+left mid-air kick. Every time I do this, Miriam kicks through the floor and I appear in the next room above me, roughly in the same spot, x-axis-wise, as I was in the room below. You wind up on top of a mound-like piece of geography, to the left of where an Ice Elemental spawns, and to the right of the room exit that takes you down into the room that I originally started you in.