Thank you for your answers ! So, I'll contact the support. The case you mention about the server based MMO example is interesting.
About the size, to be more specific the game itself is around 350mb (it's still a lot but it's a "big" browser game, around 12 -15 h of play time to complete it) but it embeds 1gb of complementary videos (our scientists explaining a bit more about the science and technology involved in the puzzles you play, the "serious" part, not mandory to watch them). The game is loaded gradually as you progress in the story, but can also be fully preloaded in cache when you're on a WIFI connexion so as to reduce loading times, data consumption , and even play offline.
@William : You mean that link: https://discord.com/channels/640867701979480070/705349661594091540 ? Strange, it works fine for me, what error do you get ?
J