[johnwheeler]

It is no short feat getting users to adopt your game engine, especially closed source. How did you manage to do that so well so far with the gallery of games you have on your site? Are those just a few friends or is there a pretty active community?

[nine_k]

A combination of good capabilities, ease of learning, and low commitment (casual, a few days or even hours of effort to meaningful result) can go a long way. Remember Flash.

[m0dE]

This is pretty much spot on. Having a low barrier of entry (no download/signup/paywall) + being easy to use certainly helps.

[m0dE]

We have an active community who are creating between 150 to 300 new games every day. Having a low-barrier of entry for both game devs & players def helps. (No download/signup required)