Thanks for the kind words. Yeah, I definitely thought about adding another layer of progression, I have a good one in mind. However, this game was more intended as a learning experience than a long-term project. I've always had trouble keeping the scope small so now I'm taking an incremental approach to scope, making games that are slightly bigger every time.
I'm already working on the next game which is a bit different, but also an incremental / idle game. It probably won't have super crazy power numbers, though. I'm aiming for around 2-3 times the features and playtime.