Well done and educational to boot :)

Suggestions:

* The looping music gets annoying quickly. Fortunately there is a button to disable it but making a longer loop may help.

* Sometimes the flasks overlap the mice or other flasks. There should be some kind of minimum distance between items

* Slightly lowering the tubes or making the liquid drop a bit faster would make it better -- its a bit too much about luck at the distance it is now and can get frustrating.