isometric style platformer help

Hey,

I've been making a game where the player jumps from platform to platform an can move around on the platforms in a 3d style (although the graphics don't show it and I haven't put in a z variable).

I've been stuck on this for a while and I was wondering if you guys could think of any way of allowing the player to jump off of a platform onto one directly below, through the one the player jumped off.

Capx: db.tt/aAFbQZkI

Cheers!

Non short link!

dropbox.com/s/8x13ggf3vdyw0a0/BEU%20Base.capx

OK so I've fixed it so that you fall when the player isn't on a platform but the whole system is still a bit rickety so I was wondering if anyone would do me the honour of messing around with it and suggesting ways that it can be improved! Improved version at the same link.

Thanks guys!