Is your autoplay mode set to preload?
Try reducing the bitrate/size/qualitt of your video, it may simply be too large.
If you want to reset a persistent object, just destroy it and recreate it manually.
en.wikipedia.org/wiki/Flood_fill
You don't have to recognize how many of a given tile are on a tilemap. Just increment a counter variable for each tile filled during every iteration of your filling loop to keep track of it yourself.
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construct.net/en/make-games/manuals/construct-3/plugin-reference/iframe
Not 100% sure, but some actions require user input to prevent malicious activity. Sound is one of them, I imagine a browser redirect would be another.
Sure you can. That depends on the platform you use to sell the game though, not the platform you use to make the game, so this might not be the right place to ask how to do it.
Search: bitwise tilemap auto tiling
Your password would just be a randomly generated string that would be used as the room name, created by the host. Others would use the same string to join the room.
Everything else.