Just thought of something interesting. I noticed that if you are way too fat then the Vampire Bat loses as soon as he tries to absorb any of your mass. So if this happens enough times then he'll actually be buffer as the implication is he gained some of that mass from the shark boyfriend. This way you're not entirely locked out of befriending the bat without having to get an absurd body size. While the plants seem like an easy way out they feel surprisingly useless with how easily you can scale up if you know what gives absurd gains.
But the irony I'm finding, not bashing on your patrons of course, they're giving you money and pay to get the game early, I'm basically finding a few bugs here and there for free. It's because I enjoy this game! I'll inform you of anything else I notice that could be adjusted.
Sorry if I sound a bit conceited.