I've removed the HTML5 version of my game (https://imekon.itch.io/wakizoids) - it seems to hang in Firefox more often than not, and does the same in Chrome. I've also noticed when it does run, sound doesn't work properly - as I press 'thrust' (up arrow) you hear the sound. You keep the button down and it stops playing as it reaches the end of the sample! Doesn't do this in the windows version.