Very nice @Nesguy! And thanks @Cyber for the motivating words…
On the other hand, I have some annoying good news, some good news and more good stuff.
Something was smelly when I observed some scenes in Golden Axe, tried scalefx etc. I fund the culprit of some irregularities and added some good stuff. The annoying part is horizontal filtering, which works as intended now, but some presets might require a bit of tuning. Maybe even not, because it looks better out of the box. Will make a new release soon.