Problem with that is that your opponents are faceless; a TAS of a vs match like that would give very little idea of what's going on or why the enemy is dieing when they are.
How about a maximized score on the 2 minute meteo war?
EDIT: Btw, 3 years ago I played this game and got really into it. Never perfected it but got good enough to be watchable. Here's my youtube playlist with deluge modes on 7 of the planets:
http://www.youtube.com/view_play_list?p=2AD226359531B31E
EDIT 2: Actually, here's something I'm curious about, but as a TAS tech demo. How many planets is it possible to get an infinite combo on? I know it's trivially possible on Grannest, and Mekks, for instance, and I've also done it on Jeljel and Brabbit but I've heard it's possible on planets like Florrest as well. On what planets can't you hit a 99x combo using TAS techniques?