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(+1)
  1. I didn't finish my game either, but the vertex limit still felt a bit high. I'd go for 512 as well.
  2. Maybe add 8 hours to the start each jam, so the "optimal" jam time rotates around the world!
  3. Themes! Google poll for themes and reveal maybe through the poll itself (if possible) or your own site.

One jam a month keeps the doctor awayth. Or something.