You have to upload the whole Unity Build Folder than just the .exe
Without it, it doesn't even start.
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Yes, now it is starteable and also playable.
Your Game needs a lot polishing (the FOV is very unusual) and the edge of the cubes of the map are weird and buggy, but this game has a very good idea, which also perfectly fits to this Game Jams Topic. It is also fun to play and a good begining point of a real game.
Keep up the work :D