Ok, after some more additions last night, I now have a basically playable level...yay!!

Rocks can be pushed and will fall (won't stack boulder-dash style yet though).

No collisions will happen with rocks and the probe when the rocks are falling yet, but warps for objects like rocks work nicely, and so do the teleporters for the player character

Switches don't work yet either, but you can collect crystals to activate the TLS beam which you then have to unblock.

Here is a screenshot of a test level:


And a video below of me completing the same test level:
http://fpc4gp2x.eonclash.com/videos/.../TheProbe.html

If the above video is too slow for you online, you can download the video (525KB 7-zip file, AVI format) here:
http://fpc4gp2x.eonclash.com/videos/...be/TheProbe.7z

cheers,
Paul