It's not done, not at all. I still managed to put a little objective/reward in it. I hope you still like it. :)
To clarify: The purpose is to sort the blocks. But as I said the game is not done, or anywhere near that. But I know my artist colleagues like the idea behind this game: Trapped inside a world without knowing, (or wanting to know) what is outside and just doing what is our purpose. And knowing that doing this gives pleasure. But even this message is hard to find in it's current state.
Nice try, a shame it isn't finished! Maybe you should have used more 24 hours and submitted it as a jam entry? I get the message and I think it's cool. As others said, some actual gameplay would help. This reminds me of another very cool entry, "love in the time of fishbowl" - http://www.ludumdare.com/compo/ludum-dare-23/?action=preview&uid=12630 And my own entry as well, which is vaguely related. ;)
I like the look of it, and it's impressive that you put in a radar. A bug I ran into is if you move a crate into a collector the crate will disappear but it'll continue to play the "beam active" sound continuously.
Is the actual goal of the game just sort blocks ?