I'm guessing that means you rolled your own canvas API code, rather than using a library like PixiJS. Is that something you'd consider open-sourcing, or is it so tightly integrated with game-specific logic that it wouldn't make sense?
Yes, no helper libraries and I coded quite close to the metal.It's probably even a stretch to call it an engine. It's just built around the specific game mechanics. It wouldn't make sense to open source that part unfortunately.