I tried to find it myself and I think it's the "Twine" engine. There is different settings possible so I'm not sure which one is used for DoL (if it's even what's used).
Twine seems great for small project and can be used by non-developers to create a game. If you search something a bit more complex you might want to check Tweego, which allow you to code basically Twine content without the interfaces
This is basically correct. I'm not 100% which version Vrel makes the game in, but considering the size, I'd expect they make it in Tweego. I would advise anyone new to it start with the Twine editor though. The main Twine editors are the 2.x version and 1.x versions, both available
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.
The story format is Sugarcube. I believe Sugarcube is available with 2.x versions of Twine as normal, but the 1.x version needs to be downloaded from the
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. You probably want to start with Twine itself before going onto Tweego if you're doing something really complex - beyond a certain size the Twine editor chugs into unusuability.
Personally, I prefer using the 1.x version of Twine, as the 2.x versions... Well, I just don't like them. I feel like it tries to be more user-friendly but in a way that cuts off stuff I like, though it's been a few years since I used either seriously. Sugarcube is also the only format I'd really advise - maybe Harlowe (I think) if you're doing something very simple but eh.
I also think Twine is pretty good and can be pushed pretty far, but whether or not it's good for your individual project is probably better discussed elsewhere before we stray too far off topic
. In short - I'd definitely recommend it for a more text-based story, and it's not a bad testing place for testing something turn-based, but I feel the engine does fall down a bit if you do something a bit more visual-heavy or reflex-based. You will hit a ceiling on how "nice" you can make things look without putting in some serious effort, and at that point you might want to consider another engine... unless you're going for the text-heavy few-choices approach, then it's pretty much solid.