Very interesting idea, i like your guts for making a multiplayer in a game jam!
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If you want an advise, its always better to implement a very easy tutorial in game than in text. Even more so in jams. Its not rare for people to enter a game, not read anything and leave because they didnt understand. Maybe just take your core mechanic to the simpliest, like, go from here to here, you are here, now its dark, other player do this, etc. Tutorials are key to get the attention of people : )