I really liked the puzzle mechanics and the lamp effect/mechanic. Was a bit confused at the start with the tile you can only walk through in darkness.
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I did really like the mechanic once I understood it. I think it's just hard with jams because you have so little time to get the player up to speed. Unlike a regular game, where they are a lot more invested from the get go. Maybe having one of the signs near the X explain it? But then you run into the other problem, players don't read. :D