Have not tried it but it definitely looks like a highly interesting app for making pixel animations on a more professional level. The full version is in-app purchase and costs
2.18 € / 3 $.
Wait I have an idea, has there ever been a full length pixel animated porno with the soundtrack being Chiptune? You now that you want to make it!
Wonder where the age limit on something like that would be?
Pixel Studio - Animation maker