I'm curious with this project to update the game engine, have always used Macs, and so was excited to give this test game a try. I was more interested in exploring to compare the world from the older engine than actually playing the crystal hunt game, but everything worked nearly flawlessly using the default settings. For those interested, I'm currently using a 2012 iMac 27, 3.4 GHz Intel Core i7 (quad core), Nvidia GeForce GTX 680MX 2048 MB, and running OS 10.12.3 Sierra. The one error I encountered was having the game freeze once when pressing the "start" button, requiring using the escape key to quit the game. All other attempts to play had no issues.
I'm looking forward to the day when this will replace the current PS engine!