You could have downloaded Frantic 1.1.1 for Mac from our application library for free. This Mac application was originally produced by Glenn Burnett. The software lies within Games, more precisely Action.
From the developer:
Frantic is an old school arena wave based shooter that is played at a frenetic pace. Run, gun and jump through each wave grabbing weapons as they appear and take on the monsters like Creepers, Bugs, Boars and Spiders; each with their own abilities and attacks, to complete each wave.
You may want to check out more Mac applications, such as Z The Game, Inferno or TitanAttacks, which might be related to Frantic.