Hello,
I've just noticed that draw_rectangle_colour() isn't drawing with all four colours, and only the first colour seems to be used for the entire draw command.
In testing other commands such as draw_triangle_colour(), it doesn't seem to execute at all and crashes the app. Although draw_triangle() works without error.
I think one of the main advantages of using GMLive.js is that it allows the user to quickly scratch together some boundary and colours for their projects, so I think to have colour commands working should be listed as important.
Only tested on one system, not sure if others can duplicate this issue.