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For those who are interested because of the tech, "CrossCode" is another Steam game that uses HTML5.

It has a demo running in the browser as well. I thought it was quite impressive back then (it's been playable for a while now).

Definitely cool to see "professional" HTML5 based games finally picking up, though it's been a few years at least since they were prophesied.

Oh also of course there's RuneScape having had a WebGL version for ages now.

Edit: For the sake of completeness, here's the Steam URL for OPs game - though you should consider buying it via GOG or directly from them instead.