What does the book do? I bought it and have no clue what it did?
For keyboard, wasd and the arrow keys should do the same thing. I don't see why they can't both be menu select and movement. I think it's because the controller support, but I also don't see why it can't be both left stick and d pad.
I think maybe the first time power up needs to be cheaper. It's taking ages to upgrade it and I don't really want to explore if I don't have time, making the grinding less interesting.
Might need some progression tweaking, but it's a pretty good game and loop theme!