Nice game! One of my favorite so far. I felt the "smash" was a bit too quick and hard to control for me, otherwise good job!
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The smash was a bit too quick for me. The light blue color for breakable was a bit counter intuitive at the beginning because I first thought it was fine to touch it but actually it is only with a smash. I think it is more natural to not die on "blue" objects, you can just let players not go through it so they will understand that they need to break it through smash.