I recently learned that this loading problem - the security issue - is mostly caused by 3rd party cookies. Sometimes to play the game you need to enable the 3rd party cookies - always, but obviously it can affect the whole browser, not only the game and if somebody - for security reasons - would like not to have a browser set in this way, would have to change the setting every time before starting the game and after pausing playing the game. So the biggest challenge here is to how to set the game so it would not cause that problem?
HerbieG
I remember the first Kingslayer and I really liked it :-)
About re-making it in Unity and probably WebGL: test it well before submitting the full game, because for some reason those Unity games are having weird issues especially with Firefox. The games are even not loading or the browser is displaying weird security communicates.
Maxiecole
Thanks man! I remember you giving me feedback :) and thanks for the tip, will do!