“Over there,” in this case, is David's great blog “Tower of the Archmage.” And he's having some trouble with getting a solo game started with his wife. As he puts it:
We both want to have fun, but our ideas of fun are light years apart... I was looking for a good naturally developed dungeon ecosystem, and maybe even a back story for the megadungeon. Virginia's priorities leaned more toward having a fun excuse to draw things like worms in sweaters, flying hamsters, and dwarven ghosts!
And that's a tough divide to bridge. You're thinking Tolkein's Middle Earth, and she's thinking Asprin's Myth Adventures.
Now, normally, I'm not a huge fan of Forge-style gaming. They've got very different goals than I do when we sit down and start rolling dice. But in this case, I think you need to take a page out of their book and work out what sort of game you want in advance. You might be able to wed the drama of High Fantasy with her fields of hungry venus flytraps and flying hamster aviaries. But it you do, it's going to take work from both of you.
As much as you can, outline what you want from the game ahead of time. Dungeon delving? Romance? Slapstick comedy? Funny accents? Ancient terrors that will rise when the stars are right? Make a list and organize in a vague way how you want these included in the game, and to what degree.
Prepare to compromise, and to stand fast where it's necessary. And then honestly adhere to this social contract. Don't try to cheat by sneaking things in around the edges. Don't suddenly spring the thing you agreed wouldn't be in the game on her about midway through the dungeon.
Then, tear the roof off D&D (or whatever game you're playing). Demolish all the boundaries you've created in your minds about what the game “must” be about. If managing a flying hamster aviary and catching rare and exotic hamsters to add to your collection is fun for you, wallow in it. If y'all are enjoying the awkward and forbidden romance between the daughter of a venus flytrap farmer and an elven rogue who always lives on the edge of oblivion, wallow in it. Obviously, you both love the fantastical, so there's some strong overlap there. Find those points of interests in the movies and shows and books you both enjoy and mine them for ideas.
Finally, allow me to scoot even further out on this limb and suggest you try reading Digger. It may give you something of a handle on how you can merge your seemingly unmergeable interests.