This looked lonely without reviews. It’s a cute app but if you’re inflexible about facing a language other than English just leave it alone rather than download and complain. There’s a small in-app purchase that seems to be for color choices. Clicking brings up a paragraph in Japanese. You can freak out, capture the text to translate or buy it like with every other app.
Controls are mostly familiar but there’s a pot that’s unfamiliar. Still, the UI is as expected.
My big issue? What you see on your screen is ColoringCamera. What this page says you’re buying is not the same. That’s a terrible idea. I return to the app description page and expect to find it by searching what I see in front of me.