It was kind of hard to understand how to play at first (there were instructions but they didn't really help), but once I figured out what to do it was really fun! As far as graphics go, I love the design of the game. It's minimalistic in a way that looks really good, and I like the little animations it does when you get points. Accessibility wise though, I do hope you continue working on the game once the rating period ends, because I think the high contrast mode you mentioned will really help. A tutorial might be nice.
Overall, great game, fun to play, good visual design, and I think if you continue working on it and market it well it could be very successful.