It's so adorable. I love the bright blue used here, its a real attention grabber. Also the fact that it's a super happy slime monster. Good use of white. It adds a reflective quality to the dripping tendrils of goo.
This obviously has a prominent element of repetition. Yet each little creature is still just angled or turned or emoted slightly differently than its neighbour. Then, of course, there is the stand-out with its quirky, macabre personality. The fact that these creatures are of similar shape to the board is nice. The very thick border around each of them helps to keep them separated.