I participated in last weekend jem and submitted "Space-man" game and when someone play my game in browser it takes more than a minute on splash screen, please someone tell me my mistake that I can fix this time.🥺 

are you talking about the loading layout screen? it takes maybe 30 seconds? but then again it may depend on connection.

Join our Discord server and ask for help in the #english channel: https://discord.gg/UfNAYGQR

you may have too many resources loaded, or too many events on the start itself...