Scaling the tower also scales your damage, so it fits the theme in more ways than one! Having your height interact with the gameplay is a cool concept.
the core gameplay is solid, but It I'm not sure if I was able to strategize effectively. I usually just picked the strongest cards I could, especially the climbing cards, and I got a score of 1020 that way. The height stat might be a bit overpowered, since having a height advantage also gives you an attack and defense advantage, making blue cards almost as valuable as reds and yellows combined.
It would also be interesting if you needed to lower yourself back down the tower at times to dodge attacks, hit an enemy's weak spot, hit enemies that are climbing up towards you on the tower, etc. There's a lot you can do with this!