Things weren't quite so bad, last night, and I managed to get a number of tiles up and running.

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See-Saw tiles are back. These simply pivot on a single tile, and flip either left or right depending on which way you walk past them, leaving impassible areas behind.
I've never been great at making good use of these tiles, but at least they're in!

Ice/Slippy bricks and bars are included in the game. They're quite a lot like the conveyor belts, but you can turn around midway!

In addition, I got Walker walking, too, and also fixed up the graphical style of the Keys and Gates to make things a bit easier for colour-blind players. .. I think!

A busy busy day!
More to come, hopefully!