I enjoyed this quite a bit. I have 3 suggestions:
1. 1024 hexes seems a bit too much, I would've liked a challenge like "reach floor X in Y hexes", then once this is hit it continues with a new challenge- higher floor and with a tighter hex limit.
2. The only thing I found unclear was the hex distribution- it appears to be random, but I don't think the player is informed of this.
3. One cool thing to shake things up would be a less uniform distribution of hexes i.e. "mostly yellow", with this distribution switching every couple floors and becoming more uniform as the player progresses, adding a layer of difficulty and dynamism as higher floors are reached.