Perfectly competent as a short story; has all the essential elements and nothing more. While how the characters and especially their relationship are set up could afford to be more precise, the singular plot beat Of Heart and Stone is essentially built around lands on an emotional level. Crucially for this kind of thing, every scene has a clear purpose and moves the plot forward, and besides maybe one instance of magical technobabble going too far, the writing is breezy.

While the character designs of the protagonists stick closely to the archetypes, the use of color is tasteful, and the amount of expressions and animation is appreciated. I also like the mechanical wolf having a visual representation, since it's such a fun detail in the story.

Generally speaking, just a cute, simple, efficient read. No opinion about the narration, since I played without it, but since the work was presented as a proof-of-concept for the engine, some notes about that:

– The aspect ratio not being fixed leads to issues with the title screen on wide displays. In general, I feel like it's going to be a lot of work for the developer to make everything work properly on all kinds of screens; being able to position things precisely in relation to each other is often nice.

– Breaking sentences across multiple text boxes is, IMO, a big no. Not sure if the UI can't accommodate enough text or if the lines are just too long, but I'd say it's something to avoid.

– Not having to sit through a loading screen is definitely a big advantage of writing the engine in HTML, but on the flip side, visually seeing the backgrounds load on slower connections is distracting.

– The engine is fairly buggy in general; both skipping ahead fast with space and moving backwards have a tendency of breaking stuff.

– While I understand that the use of dialog tags in this story has more to do with it being an adaptation of a script not written with visual novels in mind, traditional dialog boxes are definitely nice to have.

– More granular settings would be great, audio sliders in particular.

All in all, while the engine could use further development, a solid piece with a lot of effort visible in all aspects.