Why would anyone want this over a tiny tamagochi?
Repetitive, the music gets fucking boring very fast, it has nothing that makes it unique or different than the far more practical "real" tamagochis, in fact, it has much less from what I can see.
Throw in minigames, more music options, ability to customize your "blob" perhaps by buing it glasses clothes, ties or whatever. And ability to buy more colors for it. Perhaps even backgrounds and so on. (So you actually get rewarded from looking at that ugly thing...)
Add game elements like: Death if you overfeed him, or do not feed him at all, gameplay elements in general so it does not end like... this... All I see is a blob that does virtually nothing, and numbers that increase when you waste your time clicking around.
Evolution huh? Well I am not a game reviewer, so suffice to say, that you need to add elements that make gameplay interesting enough to keep playing to see these "evolutions" (because I sure as hell wont bother more with this)
Make the music calm, so you wont get fired up with nothing to make it up for, its like being expected to sit quiet in church while the priest plays a heavy metal concert (you may get the drill here)
And honestly: If you cannot think of stuff to add yourself, then maybe you should be doing something else.
There, may sound harsh, but I expect you to be able to handle peoples honest opinions. I hope my suggestions are somewhat helpful.