I have been (very slowly) still going through the ones I've bought and am very interested in your project! Unfortunately I am not a TTPRG person; in my personal half-finished spreadsheet everything tabletop has been getting put in the same category (which it sounds is what you're doing with the video games.)
What's the audience of this database? If it's mostly for you, my advice would be different than if it was for a limited group of indie TTRPG fans than if it was meant for a broad audience of everyone interested in itch.io bundles.
For the sorting I've done, for not-actually-a-game content I ended up with three fairly broad categories of "tools for making games"; "supplements to specific games"; and "tie-ins that aren't game content (for things like soundtracks and comic book adaptations.) There's definitely overlap even there, though, a book of monsters might be a prose tie-in, a player's supplement, and a game-making tool all three. For tabletop games you might also want to distinguish between software and static content.
I haven't used Access in about ten years though; how gracefully does it do multiple tags of the same type? I would be tempted to do a "tabletop" tag for everything tabletop related, and then subtags for complete playable games + my three categories, and a tag for software/static, and then maybe look at going more fine-grained with the games/systems/genres they're associated with. In my messy Excel spreadsheet I am using columns but that gets annoying fast if you get too complicated, and I think Access has better options? The categories you want to use are going to depend a lot on the options you have for structure, and how you're planning to search/filter once it's done.
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What's the audience of this database? If it's mostly for you, my advice would be different than if it was for a limited group of indie TTRPG fans than if it was meant for a broad audience of everyone interested in itch.io bundles.
For the sorting I've done, for not-actually-a-game content I ended up with three fairly broad categories of "tools for making games"; "supplements to specific games"; and "tie-ins that aren't game content (for things like soundtracks and comic book adaptations.) There's definitely overlap even there, though, a book of monsters might be a prose tie-in, a player's supplement, and a game-making tool all three. For tabletop games you might also want to distinguish between software and static content.
I haven't used Access in about ten years though; how gracefully does it do multiple tags of the same type? I would be tempted to do a "tabletop" tag for everything tabletop related, and then subtags for complete playable games + my three categories, and a tag for software/static, and then maybe look at going more fine-grained with the games/systems/genres they're associated with. In my messy Excel spreadsheet I am using columns but that gets annoying fast if you get too complicated, and I think Access has better options? The categories you want to use are going to depend a lot on the options you have for structure, and how you're planning to search/filter once it's done.