Birds and Beans is probably the best two dollars you'll ever spend on a video game. It's cute, simple, fun, and addictive, and the price is right for what it does. Both of the included games are just different enough to make them both worth playing, and the games do a good job of being simple in both design and implementation while still being hectic and challenging enough to keep you playing in bursts just to get that elusive "best high score".
The game is basic, limited and derivative, of course, and it's a very small product in comparison to nearly all DS games in general, but frankly, for two dollars, it's honestly inexpensive enough that this doesn't matter. Anyone who enjoys time-wasting fun should check out Birds and Beans, as it's frankly two dollars well spent, guaranteed.