CPU: Intel i7 4790 (Stock)
GPU: R9 295x2 (Stock)
RAM: Kingston HyperX Beast 16GB 2133CL12
Motherboard: MSI Z87M-Gaming
Storage: Samsung 840 EVO (OS)
Storage: WD 1TB 7200RPM (Game)
Display: Dell P2415Q 4K
VSync ON @ 60 FPS
Overall the performance was stellar. No multi-GPU profile, but that's not really an issue when you're pulling hundreds of FPS on max. I never came across any bugs, which is remarkable for a game on such a small budget made in the personal version of unity. There may be some for other users, but after stringent mucking about, I never actually managed to break anything. Performance across the board was great, and my hardware usage for 60FPS was miniscule in almost every area. Simply put, the game should run on ancient hardware, though it is worth noting that the UI is a little large on lower resolutions. I found the real estate of 4K extremely handy for UI juggling, though players at sub-1080p might find their screen overwhelmed quickly.
For reference, you can see how your GPU will perform in comparison to ours with this set of charts.
NOTE: Precisely 50% GPU usage means only one GPU was put under load on the 295x2. This may indicate a lack of multi-GPU support.