My mistake! I had accidentally uploaded the threaded html5 build instead, which is incompatible with itch.io. That should be fixed now (though you should still use the threaded version for Chrome/Firefox, please follow the link in the description).
error: "response.body is undefined"
when trying to load, but others (aside of adobe/flash) in webgames, are playable e.g. Meowmie works fine?