It is out now, but apparently a few issues with it currently
At first it was broken, did not contain all files. This has been fixed.
It does not register all controllers. Some 360 controllers might work, but dual shock controllers does not work. I tried my DS4 using both inputmapper and DS4windows and neither register.
It does not support widescreen, so it will either give you massive black borders or you can uncheck aspect ratio, but it will stretch out the image.
Tied to 30fps.
Going to try it not since Hearthstone EU servers are busted and I can't open my packs
EDIT: Fix for controller issue
In Windows's gamepad settings clicking on Advanced bring up "Select the device you want to use in older programs" Selecting the Xbox 360 controller from the list fixes the issue in game.
Can confirm this works since I just did it and controller is now detected. Fix should work for win 7 (from steam thread) and 8.1 (what I use). Not sure if the settings options are the same for win 10. If you are using a Dual shock controller, be sure to run DS4 windows or inputmapper first to register it as a 360 gamepad to get the option to change it to a 360 controller rather than just "windows controller".
Also tried disabling the aspect ratio. Even though everything gets wider/fat it is somewhat worth it since the black borders on a 1920*1080 resolution = roughly 1/3rd of the total surface of the screen.
Have noticed a strange audio glitch though. Some indicator noises before battle sounds like a midi tune all out of synch. Don't think it is supposed to be like that.