You can check out the source here (BSD Licensed).
There are no binaries yet available. However it does build under win32 using mingw and OS X using xcode assuming you have all the prerequisite libraries (see below). Note: The Lua bindings are automatically created by gen.py in the /gen directory.
It's also still alpha-quality so if you're looking for a more mature platform check out the Love 2D Game Engine. InfiniteRay differs from the Love engine in a number of different ways but primarily InfiniteRay is C-based and Love is C++ based.
(Short Video Demo)

(The loader screen)
Features:
- Lua scripting language
- Structured view system to easily create complex compositing heirarchies
- Asynchronous resource loading from files or zip archives
- Drawing support utilizing the cairo graphics library
(http://www.cairographics.org/)
- Font rendering using the freetype font engine
- Asynchronous TCP/IP network support
Library Dependencies:
- FreeType 2.3.11
- Cairo Graphics Library (libcairo,libpixman,libpng)
- zlib

(The asteroid example)