Hi Product Hunt! I hope you're having as much fun using it as I had making it—it's all open source, too: https://github.com/vikrum/kiddop...
There are a bunch of hidden feature sprinkled throughout, but if you're liking the emoji stamp, you might like these: (press and hold key on stamp tool)
Shift: double the size
Alt/Option: flip/mirror
Command+Scroll wheel: Change the color/hue of stamp
Cheers!
Product Hunt
Product Hunt
Gold Fig