A little known/used minimalist javascript/HTML engine is Quandary 3.
Extremely easy to use and customize. Compiles to HTML using Javascript.
For Windows or Wine. Has easy handling of game states and images.
I used this engine for an example game called Fabled Journey:
which was mainly written to explore Quandary features.
Just thought I would share, as the engine might be useful for
someone interested in a minimalist, easy to learn engine.
John