Note: This is just "My Personal Opinion & Assessment", not intended to "Judge" the reviews you have made.

Pros:

• Idea / Innovation
  Hum-On / HumOn, providing convenience in music creation. Now, everyone can create their own music with various instruments provided.

• Design / UI / Spec
  The UI is easy to understand and master.

• Features / Advantages / Benefits
  
  Various features are provided to make it easier for you to create music, and share it.

• Price
  Free use - advertising - payment.

Cons:
There are ads that appear, although this can be eliminated if we pay the application.

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