Simple and addicting! As a math person, I love the gameplay. Made me a bit better at recognizing multiples of 7. Idea and art aren't anything too fancy, but they work really well. Bossfights are creative, even though there are only two. The special cards are really cool and fun to use as well!
I actually couldn't find the special cards tab in the shop for the first few rounds though, so I do wish that would have been just a bit clearer. And some of the descriptions of the boss reward cards are a little confusing. But overall really fun!