The system requirements are high for what it is.
OS: Win 7 64-bit
Processor: Intel i3-3240 (3.4GHz) or equivalent
Memory: 8 GB RAM
Graphics: 2Gb DirectX 11 (AMD HD 7800 series or equivalent)
DirectX: Version 11
Hard Drive: 4 GB available space
Sound Card: DirectX compatible
Additional Notes: Spec will be revised continually during Early Access
Now I understand that being Early Access it is still in alpha/beta/pre-release stages so there will be code optimization and such which will bring the spec down in due course, but even so, 8GB of system RAM and 2GB of graphics RAM are a lot for what I've seen in the videos.
I just bought it. I'll check it out tonight and report back to how it run on my home PC.