I enjoyed figuring out the puzzles by trial and error, although I wasn't able to figure out how the mechanics work exactly until the end. Maybe I'm just dumb :)
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A tutorial text is okay (especially in a game jam). Better would be a level or two where you have to apply the main mechanic in a simple way so that the player gets it immediately. Like you did in the second level with the seesaw. That was great cause it makes in instinctively clear that you can travel through grey bricks but not through white. If you can add a level like that for the numbers that would be awesome!