Great job on the Pre-Alpha so far. I was able to play it in Windows just fine, and of course, loved the action!
With the next release notification I tried the Linux pre-alpha and found it was available. So of course I downloaded and gave it a whirl... Damian mentioned that it was not previously tested.
OS: Mint 17.3 64-bit
CPU - AMD Phantom 3-core
Video card - Nvidia Geforce 550 Ti 2GB
Video driver - Nvidia 352
Memory - 8 GB DDR3 1333
Resolution - 1680x1050
Fullscreen - Yes
So far there are a few bugs, I took a few screenshots of graphical artifacts and stuff. I found that most of the artifacts on the screen like flickering is due to particle effects. Like when an object is floating with particles around it, once I grab the object the artifacts go away. In fullscreen the main menu button "hit" state doesn't line up with the actual button graphic, the "hit" state is above it. When I played in Windowed the buttons worked fine. There were also some moments when my character and minions have no textures at all, instead they are completely black
I totally look forward to more releases and will continue testing.