When learning a new game engine, one of my first programs is always a Super Mario Brothers clone... so here it is!
This was created using no plugins, free version of Construct 2, less than 80 events. Basically, I wanted to see what I could do with Construct 2, and I'm quite happy with the results... little effects like bouncing blocks and shattering bricks, parallax and GUI, enemies reversing direction on collision with walls, platform behavior but also the ability to climb up and down, etc. Everything is quite straightforward. My conclusion: Construct 2 is awesome. (But you already knew that.)
It is not a complete game by any means -- there is only a single screen, the player cannot be hurt, and the points awarded are pretty monotonous. But the framework is certainly present.
If there is interest, I would like to write a tutorial containing the details and/or upload this work (in progress) to the Scirra arcade, but is that acceptable given that the artwork is unoriginal -- borrowed, one might say? Is there a copyright proviso for educational purposes?