Well, something similar happened the other day with the current game, and damn am I glad that I didn't go forward with the game the way it was.
Until now, it always felt like something was missing, nothing really stood out. The first area in particular was meant to be incredibly easy, and didn't have much to it. I kept telling myself that the game would be more fun once there were more elements to the levels, but to be honest, I don't know if it would have.
After adding the new mechanics, on the other hand, I actually found myself going through that first area multiple times and enjoying it, each time doing it a different way, and each time getting better at it, learning new ways to utilize the new moves. And each time I got better, it was satisfying to go back and see what I could pull off. I feel like the game finally has a mechanic that's fun without all the fluff to try and make it better.
I'm sure I'm making it sound more fun that it is, of course, but I suppose it's just because my mindset went from "This game is bland and I don't want to work on it" to "Hey, this is actually pretty fun". I'll have to change some other elements of the game to help compliment these mechanics, but, overall I think the game is going to be much better for it.
Edit: Er, just to clarify, it has nothing to do with that picture -__-