AVX-2 support is now implemented (for those systems which support it) for filters which have scan lines and for the "gamma" filters (Brighten, Darken). There may be further AVX-2 optimizations implemented in future.
Shine, a first-line filter for increasing the brightness of bright colors (similar to CRT characteristics) had a bug which made it awkward to use. It is now fixed.
The tutorial vid which runs on the Steam page has been uploaded to Youtube and is accessible from the Support button.