There are a lot of one-room escape the room games out there, where your only goal is to get past one (or a few) puzzles to get into the next room. Suveh Nux or Enlightenment are good examples, with a series of flash ones available all over the internet.
69,105 keys is very straightforward- one of the keys is unique to all the others, and is thus the key that opens the door.
Realistically, it seems like, were you actually THERE in the room, you could quickly scan the keys for the unique one, but maybe not. Instead you have to count them based on several distinct qualities, like their color, whether they have a scrach on them, the brand name, etc.
The game has numerous sesame street references, such as the "one of these things is not like the others" songs, and references to the count, and ever a dirty mode, in reference to the youtube "censored" count song, which was kind of cute. There are even references to how much the PC hates tedium, which is funny, because the game is specifically an exercise in tedium.
I rated this higher then other tedius games, becuase the humor kept the game going, and the puzzle was very easy and straightforward. If you were just learning how to program Inform, or some other system, this is the type of game you should make, one straightforward puzzle that gives you the opportunity to program several different commands well. No doubt further games by this author could be much more involved.
The story isn't very deep, but neither was some of the other great one-room games. Let's face it, how much story can you put in a one-room game without some kind of loaded backstory or cut-scene? And the game doesn't pretend to be anything bigger than it is, and I give the author props for that.
So if you're looking for a quick diversion- this is the game for you. If you want a long puzzle or conversation filled game like Enchanter or something, look elsewhere.