I got to level 7 and 165 score. I exited the game as I think the game is not becoming harder after reaching level 7? Anyway, it was very enjoyable, well done!
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It wasn't very hard, mainly due to the lack of additional color combinations afterwards. So once I "mastered" all the color key combinations, it quickly became very easy, regardless of how fast the fruits drop. I'm not entirely sure if adding more colors is the right solution, though, because you probably want to slow down the game a little bit if you introduce new colors.