One question: have you considered to release the sources sooner or later? By the way, really a nice idea and great work!
First of all great work! I realy like your attention to detail and the love you put into TIC-80. To support your work I donated a small amount of money. But enough flattering and bribery ;)
I too would be very happy to see your work being open source.
The main reason for me is, that I enjoy the feeling that even if something breaks in the far future, sombody or even myself can grab the code fix it.