Attached are two test files, built from the Bug-Byte version:
MM Fall Test One.Tap 32.73KB 106 downloads
MM Fall Test Two.Tap 32.73KB 112 downloads
There are slight differences between the two, as illustrated by the combi screenshot...
... In essence, the gap is larger in 'two' compared to 'one' , the portal and items immediately above are a block higher.
The reason for this second file is if M.W falls in 'one' he can land and walk on the floor area underneath the portal. The extra file was needed to confirm if the small gap at the top between the water platforms or the portal was the immediate cause.
The use of the conveyor and gaps left to right along with the conveyor being further down was to test out the effects of left/right exit with regard to M.W's position when he emerged on the other side of the screen. The 'saw' guardians are set to slow and mainly there as 'filler' along with the roof nasty fire cells, easily avoidable.
They were built mainly to test the effects as indicated above, falling and jumping through left/right nearby or onto cell types. The layout of the cavern was picked to be relatively simple to quickly tweak to do 'other things'
It should be noted this is a cut down game file, no cavern data exists beyond the first one! Attempting to teleport into the next cavern will result in a lockup! The INC A instruction to increase the cavern number at 36907 / #902B was NOP'ed out to prevent a crash when completing the cavern or running demo mode.
The files provided are the full 32K ones with a mildly tweaked loading pic (simply as I had it to hand as an executable file rather than screen data) but are JSWED editable (at the loss of the non-standard loader but that's not a concern, again I had that 'to hand'). It would be quite easy to provide a much truncated file but this would then preclude ease of editing.