Time Clickers is a free to play clicker game developed by Proton Studios Inc.
"Your mission starts now!
Collect gold, upgrade your Click Pistol & hire a team of elite sharp-shoooters to help with defeating the enemies in this clicker idle game. Not a fan of micro-transactions? Then this is the perfect game for you, since it has no micro-transactions or hidden fees."
OSX 10.6 +
512 MB RAM
100 MB available hard disk space
Free download at steampowered.com