Hi darkempathy!
I posted a comment on this game's page explaining the maximum 15 level cap. Basically as of Version 1.4.3, the current maximum level cap is 15, mostly so players don't become ridiculously overpowered for when the next chapter is released. It will be raised more when it is released though!
Also, I've noticed that I've been getting a lot of views and downloads from the audiogames forum, and I've been secretly browsing through the post about my game. It's actually been pretty fun hearing all of the criticisms and nice things said about my game. I wasn't expecting it to become mildly popular on an audiogames forum, but it's still pretty cool!
Thank you for enjoying my game. I've been hoping to add more content aside from just battling enemies all the time, and I've also wanted to add a lot of post-game content as well!