Played through all the 20 levels and really enjoyed doing so.
Presentation is very nice - it's very unobtrusive and very "bubble bobble / rainbow islands", so would appeal to the younger audience and (without being too stereotypical) the female customer base. The spot effects are nice also, for example when celebrating completing the level and the splash sounds.
One comment would be about the level design, there seemed (to me anyway) that there was a slight anomoly in that some of the mid levels seemed more difficult than the later ones.
Finally, this game might be a candiate for something like Facebook - have you considered that as an option?
Overall - very nice work - congratulations!