This is a pretty entertaining game. However, there are a couple things that drive me nuts: 1. the ads. It wouldn't be so bad, except I have the banner ads, but the ads to get 5 undos or an extra bottle won't work.
2. the colors aren't always easy to distinguish, especially a couple of the purples (though using a different bottle helps some). Having a option to add a texture (even just a symbol) or to somehow light up all instances of the same color would help (maybe you tap a box, and then instead of tapping to pour, tapping would make the matching colors glow).
There are another couple things that would be nice to improve. First, the reset button. It's nice that it starts an entirely new game, but it would also be nice to be able to choose to restart the one you're on. But if it has to be one or the other, it's better the way it is. Second, it would be nice to have your game save when you close the app (I have a solitaire game that does this).