Every couple of years I'll play a game with this new, innovative idea, and it's still the same story. It's sort of fun for a bit, until your brain catches up and realizes that as meaningless as most games are, this one is even more so. It's not a new idea and if it were going to work, it would have been made to work by now: http://www.intellivisiongames.com/bluesky/games/credits/spac...

(No, there is no in-between "just right". Simple control theory shows how you can't hover at the "just right" point; as you are at "just right", the system must dynamically adjust the difficulty above your level (or you even just hit a bad patch) and cause you to fail, at which point you're back at too easy. There's nowhere near enough data to get to "just right" even in theory.)