It's a classic style of game, this bubble-bursting thing, and I happily played a couple of rounds of it. There's an issue where multiple colors are cleared at once (which was actually the only way I managed to complete it lol). I feel like the gems should be locked to a grid, make it feel a bit tighter. Also (as Ameripon said) in the late game, just detect the gems left and give me the colours I need, I'm not here for a challenge :P
The comic illustrations were really nice and full of character. Perhaps it would have been worth spending some time on creating assets for the gameplay/UI elements in the same style to make the whole thing feel more cohesive.
A solid start to a casual game, great work!