I love this. I am a connoisseur of sticker games so I clicked on this right away.
It took a bit to get used to the controls, but as the game progressed my skills grew and I could smoothly stamp around a shaped border using the scroll wheel, left click hold, and right click, all working together to create that perfect cut.
I sometimes found myself wishing I could finish cutting a sticker to my own satisfaction, even after the game decided it was good enough, but then that became part of the gameplay. It's fun to try to have the last cut be a big chunk so that sticker completion doesn't trigger before I want it to.
With the art, sound, story, and music too, I'm very impressed how much you got done in so little time, good work team!