The game is pretty fun. I somehow got a 3 of a kind from 6 6 5 (the 5 fell on a -1) but the rest was fun, the music was nice as well. I wish the rounds gave more points tho, good game!
I finished in 14 round with 556 points :)
I'll see if I can repro that -1 issue. It might also be a readability problem, the areas near the edges are -1, but the other ones close to the center are +1, and they're a bit hard to read unless you're playing on full screen. Maybe your Three of a Kind used a hard to read +1?
In any case, thank you so much for the feedback!