"My name is Matthew Devaney and I believe taking the time to make your own game is one of the best PowerApps learning experiences you can ever have." 

There, I said it.

PowerApps is a platform used by serious people for building Serious Business Apps (tm) that save serious time and $$$.  So why bother to make a game?   Brian Dang who is a well-known game-maker in the PowerApps community put it best:

Still not convinced?  Take a look at these 5 things I learned by making a Crossword Countdown: A PowerApps Word Game.