The door bit was just a secret. I was going to use gel colour and number of lights as a code for a map later on. to get back up yu need to of placed a portal first. there wasn't meant to be anytimes though, I shall look into this.

A good map, but I wasn't able to finish it.
I think you may have screwed up the timer with symbol \, because it's only on for 2 seconds, which isn't enough time to get back up and through the door.
Also, I found the cube but I couldn't get back up, so I cheated (yes yes I know...) got back up and put the cube on the button, which revealed a room with only some white gel in it, which I suppose you use to get the cube back up, which is a paradox.

I may be stupid and missing something, in which case silly me.

P.S.: this map helped find a few bugs (with the engine, not the game) like if you hug a wall while falling, you randomly lose your momentum.