Not a fan of vore and not particularly enthused by cumflation, but harem-building sounds great, especially if there's excessive amounts of cum in bukakkes.
And hey, the trades themselves are fine for the most part, in fact, I'd say that it's a pretty good supply-and-demand system for bartering. It's pretty hard to make a trade system with no money involved. It's just that trying to fuck things up by raising the relationship too high... fucks things up. The only problem I had with the system otherwise was that I was constantly stumped by trades being rejected at 0 profit difference. Which I get why it's there, since then you could just farm that for relationship over and over. But a better solution for that would probably be to make 0-value trades just not raise Relationship, but I get that that wouldn't have been feasible in the time-frame.
Might I ask what the gameplay is for this gamejam? Or is that classified info