I can tell a lot of attention and care went into this submission. The art and overall atmosphere / concept is fantastic. It's unfortunate that the nature of game jams often results in a lack of time to do proper balancing, because this is my favorite submission of the jam so far, but alas, I can't beat it. I played it for about 2 hours, mapped everything out, and could get really close, but couldn't pass the finish line.
I get the feeling that there is only one very specific set of moves that can win, and it may even be determined by RNG. For example, on turn 2, you get a clear lead if he plays the yellow 5 first, but he doesn't always do that.
This is a great concept, and if you guys work on it anymore post-jam, it would be really neat if you played against multiple enemies of increasing difficulty. Throwing the player a bone and letting them steamroll an opponent or two gives them a lot of motivation to keep going when they hit the brickwall that is Hieronymous Bonechill.