Victory March
Victory March is a fun side platformer that has you playing as a war hero. You can take your pick in playing an American soldier or as a Soviet one. The main goal is to simply jump from one platform to the next while killing enemy soldiers.
Developed by Anton Butsev, the game features a very addictive gameplay that will make you want to play for hours on end. It's certainly a great game that's worth checking out. Best part is that the game is offered absolutely free on the Mac App Store.
It might be simple but ultimately, it does the job in keeping you entertained for a good couple of hours.