Hi! I'm interested in participating but I'm not sure about the minimum age, because I'm 15. Also didn't found anything related in the itch.io page soooooo... 

We haven't mentioned it because there's no way to enforce the rule as we'd be illegaly asking for IDs to all participants.

With that said, we have updated the rules and we can confirm this is an 18+ event so you can't join it, sorry.