My friend bought it and asked me to help get the game running on his linux laptop - intro was working then black window. I said "maybe it won't run at all because system requirements page says DirectX 11 and DX11 support in wine is in very early stages, about 10 games run, that's all. Imagine my surprise - game uses same engine as Raiden IV and will run on any machine that supports OpenGL 3.0 (maybe even 2.x). No D3D11 or even 7,8,9 etc and it looks like it doesn't use DirectX AT ALL - it's all about OpenGL and SDL. And yeah, game runs in wine, just not in the newer versions, at least it won't run on every system in latest versions, in 1.7.24 it works perfectly. Same as Raiden IV which doesn't like nVidia + latest wine.

So it's better to edit requirements page because a lot of people with 2008-2009 PCs which don't have DX11 support in hardware will skip this game when they can easily buy and play it at full speed, just like Raiden IV.