Currently, this library uses parts of openSAGE, which appears to be licensed under LGPL since these files are not Quarantined into their own assembly and linked to the project, the entire library technically should be licensed under (L)GPL. This project currently has no license and to put one up would take very little time, if you would like to remove the LGPL'ed code as stated in your SimpleGUI repository, I do have replacements.
Currently, this library uses parts of openSAGE, which appears to be licensed under LGPL since these files are not Quarantined into their own assembly and linked to the project, the entire library technically should be licensed under (L)GPL. This project currently has no license and to put one up would take very little time, if you would like to remove the LGPL'ed code as stated in your SimpleGUI repository, I do have replacements.