Status update:

I'm almost completely done re-working the level to use to the new tiles properly. Just a couple of spots to fix.

I decided to add lighting effects to one area. It looks great for the most part, but it caused a bug in a sequence of secret chambers. Removing one room from a sequence of rooms connected by teleporters fixed the bug. The "removed" room still exists, but it no longer part of that sequence of chambers. It is now a secret accessed from an entirely different part of the level (VERY hard to find, too).

I still have to work on the enemies at the end of the level. Most of them are either too hard to deal with at the speeds I'm, uh, encouraging players to move at, or they're too easy to simply run past and not have to deal with them at all. I need to find a way to balance it. I will keep working on it until it feels right.