There is a height cap, unfortunately. I think the cabal in the mountains can make you up to 12 feet tall? But yeah, that is the cap unfortunately. Part of the problem is that a lot of events don't make sense over a certain height. Although to be fair, they don't make sense after a certain weight either. So I might add something to the cheat menu at least at some point.
Either way, I'm really glad you've been enjoying the game so far!