Mainly controlling the bubbles and dropping them doesn't work very smooth. The concept is good, but graphically it's not very appealing. Still, things like being able to put the bubbles in the correct places have some errors. You can't place bubbles near the lower edge of the field, unless you move the mouse after having dropped. That works a bit odd too, the fact that you actually can move the bubbles after having dropped them. Sometimes this almost freezes the game.

It's not a bad game, but it doesn't have any extras, no original features, basically it's stack 4 colors, which is rather easy at this speed and then you'll get some points. It also suffers from major slowdowns and 'almost freezes' at some times. The one minute time at start is not quite enough to get any points at all, but 5 minutes is way more than 1 minute off course, so it lacks a bit of balance there.

I'd especially encourage you to work on the controls and gameplay. Graphics are less important, models and things can easily be changed, the bubbles aren't bad. The gameplay is simply much less interesting than some of the other games,

Cheers