There's no information, not even a link to the documentation, so I don't see how this compares with SDL or anything in the same space. I don't know how to map this on to existing knowledge, sorry.
This is an internal library for the kickstarted game Elysian Shadows that was not yet ready to go open source. He's plagiarized it... and used his real account with all of his contact information... oooopsies!
