You could have downloaded Briblo 1.0 for Mac from our application library for free. The program lies within Theming Tools, more precisely Screensavers.
From the developer:
Briblo is a stacking brick style screen saver game.
The twist is that it is in oblique view, so you have two axes' in which to rotate & move you pieces as they fall.
The cursor keys move your piece, and the space bar rotates it.
Works with dual screens!
You may want to check out more software for Mac, such as ART FOREST MAGIC CLOCK, which might be similar to Briblo.