It's in fact two games:
1) A set of animals the baby can move around and that makes noises.
2) A drawing board with multi-touch support and pressure sensitivity.
For getting out of the game, press 3 times on the "back" button from the main screen.
This game is made for tablets but works great on phones as well.
I know that there are multiple apps like that in the Google play store, but they all have adverts or you have to pay for them.
This one has no advertisement and is 100% free.
Heat is an interactive touch experience simulating a temperature sensitive surface. Drag your finger across the screen and watch it react with an array of colors.
Try out this Ad-Supported Free version which comes with 2 color schemes and if you enjoy it, buy the fully featured version for only 99¢