I wasn't feeling that well yesterday - probably a result of pushing myself too hard to finish the Diagonal Game Library prototype by the end of the weekend - so I didn't get that far in my first demo game. Currently all I've got is some sample game objects displaying placeholder graphics I whipped up in Inkscape, a paddle you can move with the arrow keys and a ball that bounces around the screen but doesn't interact with anything.
Tonight I'll implement the collision detection to turn this into a game. The collision detection is essentially the only challenging thing with an Arkanoid/Breakout type game; it's pretty easy to hack together something that works in the trivial case, but harder if you want to implement multiball or balls that move at significant speed.