I like the sprite set you used for this, it's got a nice Gameboy Advance feel to it. I have to admit I'm not a fan of the models used for cutscene art, though. I'd rather see something like the sprites for the succubi instead, if you made those yourself. Otherwise, getting some drawn or pixel art for the portraits/cutscenes, whether by commission or collaboration with an artist, might be a good idea if you continue working on this. The writing is solid, too, with some amusing dialogue and interesting ideas behind the quests and plot.
I ran into some bugs, though.
1. When I was doing the grocery shopping at the castle down, picking the 'later' option the apples/tomatos choice and going back to the temple gave me a cutscene as if I had picked apples, and afterwards I had Barb's portrait stuck on my screen(the debug tool fixed it). I also walked over the sprites for the store buildings there, too.
2. When I fought the succubi in the desert cave, losing to them from energy-feeding caused the scene to reset from the beginning and threw me back into the fight.
3. The Guide at the docks on Parad Isle disappeared after his dialogue. And I'm completely stuck at the beach, but I saw the message on the game page saying that it's not finished, so that's not really a bug.
I haven't gone the other route to the mountains yet. I hope to see this get worked on some more! It's a nice, straightforward RPG that doesn't seem like it'll be a long haul to get through, which I think is a good thing as a vehicle for kinky shenanigans like weight gain.