See inside, zoom out, set the stage to small, make your browser window as small as possible, enable turbo mode, press green flag. A reasonably fast computer is recommended, though the worst case scenario is just getting dropped frames. TurboWarp may help.
This project was generated by a giant pile of hacks^W^W^W^Wfew shell scripts and Go programs I wrote: https://git.d2evs.net/~ecs/scrapple This is actually a full video player, capable of playing anything ffmpeg understands, see the git repo for details. Thanks to @scratch_cat3 for the original inspiration, for help debugging, for suggestions for pixel formats, for help designing the abomination of a video format, and for allowing me to rant at him about the horrors that are Scratch's internals.
