Not sure what they are looking for from the game design question. I don't think all the steps can be finished within the given amount of time. I guess they want to see what you will do under the pressure from time constraints.

I went into hacker mode and haphazardly implemented everything in a rush (I thought my interviewer hinted that I should do that), which I should not have done. For future interviewees, you should probably slow down and write good code even though you don't finish the steps in time. The two algorithm problems were trivial (and the description had some flaws)