I've been looking for first-person-slashers since Ghostrunner came out. Codeslicer looked like an interesting addition for my small collection, but there are some serious problems that need to be addressed (v 1.2.9):
Unplayably slow (barely above 0fps). This might be an optimization issue, but no system requirements were given which may be helpful.
My system specs: Intel(R) Core(TM) i5-3570K quad-core CPU @ 3.40GHz, 10GB RAM; Windows 10 64b; nVidia GeForce GTX 1050 Ti, 4GB video RAM.
No invert mouse Y option: I consider this option *Mandatory*.