This is an interesting concept, but I'm not sure if fits the jam. The reason tamagotchi's were on their own separate device is so the device wouldn't need to share resources with other things. I would expect a virtual pet to interfere with the ability to use the phone for other things, whether it be as a phone or other games the person wanted to play (such as with the suggestion in the description).
Also the text "-- PRESS ENTER TO START --" doesn't look like it's the same resolution as the rest of the screen.