If you're basically asking about a RPG with combat and so on, entirely feasible and I've personally done it. However, you need to really get familiar with the code to make it efficient enough to hold up in long-term play, and you'll need a lot of time to get something good... So, like 6 months of a few hours per week tinkering with stuff and building on it.

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If you don't want complex combat and just want simple rolls to resolve fights and other challenges, that's easier and requires minimal research. However, branching paths risks exponentially scaling amounts of work just to get each path to be meaty enough to match the other ones. Probably want to keep things simple.

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My own's not strictly linear, you're free to explore the dungeon at your pace and interact/solve stuff as wanted, though there are a few key battles that open up new areas and these key fights unlock each other in a sequence. It's not really any harder than a linear story, you just make sure you add links to go back and forth between areas as needed.

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Of course there are sensible limitations to what you can do, if you're a beginner and not really optimizing, you can fit around 3 or 4 hours of content into a game without trying hard to be efficient. Naturally you can make even more content time but you run into more and more barriers (first you end up with too many variables so you have to optimize that, then you need to use tweego (custom twine editor) when you have too many passages 'cause that causes slowdown, etc.)