Hi.
Let me ask you a few questions about this beautiful jam.
1) Can I use Free Open Source? (tbs for example)
2) What engines are permissible? (Unity3d? Unreal? GameMaker?)
3) What genres are permissible? (for example, under this theme, is it possible quest game / strategy)

P.S. I'm from Russia and therefore use Google Translator :) If something is not understanding or something else, I can throw off the original, or translate in more detail. Thank you for your attention ;D

up?

So... Okay... "Nice"

Hey Valsi!
Sorry I took so long to answer. Its been a hectic week:
1) You can use any open source tools or assets
2) Any engine you choose is permissible. Even one you've built yourself. What's important is that its clearly an 'engine' and not a 'prototype'  or unfinished game.
3) Under this theme all genres are permissible..  Only limitation on content would be no offensive content.