Have you tried asking for help with how to invent/build contents & fun-factor on the TIGsource forums? There seems to be a section dedicated to "the non-programming aspects of game-making":
Also, I'd think people like to help with generating/brainstorming some ideas when provoked, like you're doing here with throwing around some thoughts. I can barely resist adding my $0.02 of random suggestions already :)
https://forums.tigsource.com/index.php?board=5.0
for example a "sticky" thread titled "Game design resources" from one of the subforums:
https://forums.tigsource.com/index.php?topic=31350.0
Also, I'd think people like to help with generating/brainstorming some ideas when provoked, like you're doing here with throwing around some thoughts. I can barely resist adding my $0.02 of random suggestions already :)