Error box titled "Uncaught Exception" with the following text:

Failed to initialize DirectX driver (DXError 80004005 line 112)

Called from h3d.impl.DirectXDriver.reset (h3d/impl/DirectXDriver.hx line 167)
Called from h3d.impl.$DirectXDriver.__constructor__ (h3d/impl/DirectXDriver.hx line 131)
Called from h3d.$Engine.__constructor__ (h3d/Engine.hx line 72)
Called from local function #1722 (hxd/App.hx line 46)
Called from hxd.$System.start (hxd/System.hl.hx line 105)
Called from hxd.$App.__constructor__ (hxd/App.hx line 45)
Called from $App.__constructor__ (App.hx line 3)
Called from $Main.main (Main.hx line 18)

I'm on Windows 7 and have DirectX 11 installed. Do I need a different version, maybe?

Tested it on a different Windows 7 machine. First error it gave me was missing D3DCompiler_47.dll; fixed that via a Microsoft update. Now it gives me the same error as above. Has anyone got it running on Win7?

I play it at home on windows 7, but I have a lot of directX stuff installed because of all my XNA/monogame dev

Yes I'm currently working on it . I will let you know as soon it's fixed.