I like how there's always something that you can upgrade in throughout the game. It's like building your own little empire.
The main thing I wish there was, though, was an option to speed up the game. It takes a long time waiting for things to start happening, and then when you die and have to start all over, you have to wait all over again.
I also wish there was a save button (which branches off of what I just said) so that you could go back a certain point in the game instead of having to restart the whole thing. Otherwise, it makes it rather frustrating to replay the whole thing.
Besides these two things, I really liked the game.