A really good port of a match-3 game. Good job. Love that the palette changes every level, it makes it interesting to complete a level since in this type of game, it can get repetitive. I was not a big fan of the purple palette of Level 4 due to the contrast of my monitor, it was a lot harder to look at (I was happy it turned to teal afterwards!)
Great job, the music is awesome too! The jewel sprites are all enough different to notice them too despite the limitation in the colors.