Not sure if this is specific to my OS X version, but the game is unplayable. I get major hitching after about 10 seconds of gameplay. I tried adjusting all kinds of game options.
The hitch happens at a regular interval, about once a second or so. Not sure if it's a garbage collection occurring or what. Activity monitor shows nothing unusual - no high CPU usage, memory is constant, etc.
Anyone on Mac seeing this?
I installed under Parallels, Win10 and the game plays great.
iMac 27-inch Late 2012
3.2Ghz i5
16Gb Memory
nVidia Geforce GTX 675 1024Mb
Mac OS X El Capitan 10.11.03
EDIT: P.S. This game is fun. Got to normal floor 5 on my 9th run and died horribly in a laser room. Music, sprites, bullets, controls, are all slick. Good job.