Aseprite’s developers work hard on the main features and I do my own thing here, I think it’s a good arrangement. 😀 If any extension I make proves to be useful and popular among users and it gets integrated or ported to the main release then it’s a win-win situation for all of us.
And if you mean the Substance Sim - most probably not this month, I have more features to test there and other, much more practical extensions that I want to build first. ✌️