A few issues.

Great app; just stick a few random dots anywhere, and some flourishes will get you music! However, there are a few issues: a, I noticed a seeming glitch where sliding your finger off the right side of the screen will activate the entire row touched, and the square under it on the left side; b, activating too many squares at once makes the game crash; and particularly c, your board is always 10 high and 16 long; you should be able to change those to make it more flexible.

Tonguey Kinkajou about Melodica, v1.2