Interesting concept. Also surprised no awards/achievements for minimum number of moves to solve a level, no speed run, and nothing (in the easy levels at least) like color mixing or some sort of negative for running over the wrong X or wrong painted color.
I liked it, though I felt the interface was so slow. I'd love it if I could hit keys (zxcv to attack bnm, or something?) instead of using the mouse... I was seriously looking for my video game controller to use arrows to select or something.
I like it. It's like mastermind coupled with a sort of blind text twist/word twist/Boggle. I kept http://www.oneacross.com/ on my alt-tab as I played, though. X is my friend.
For what it's worth, it's nice that it's playable with one (left) hand.
Pinky on A, Ring on S, Middle on R, Pointer on B.
R- Roll; B (or T) Bank/Take
A, S, D for selection of points. I was using 12345 but it wasn't worth it when you can use A S D (top -> down) to select the points you want.