To whom has problems with the numbers that fade only if the scheme is solved correctly: you can try to solve the puzzle without trials, and when it happens that you make an error you just begin the puzzle over again. That's a way to avoid the trick, although a bit annoying.
Good game, I think the timer isn't that bad. Perhaps to improve it you could make a level mode with a target number of rings to collect. The subsequent level should have higher velocity of the kite. This way you would have the challenge without the timer.
Nice little game, but I agree with echelonus: perhaps you could make another modality with the mahjong strategy. This would make the game sweet, letting you choose between speed and stategy. Still 4/5
Little bug: I can purchase the diamond chassis the many times I want (I spend the money but get no improvement, while on the other purchases it appears that the investement is unuseful).
I think you are a talented writer as well as a skilled painter. And you used music very well, that's why this is not only a well done comic. Great job.
P.s.: You can appreciate the story only after playing the second and the third part, as someone else has already noticed.