It may just be early yet while you still work on things.
But just in case it was missed, I found that Slim Recents in 8.1 is missing the feature to "Only Show Running Apps".
I usually check that option to cut down on clutter in the Recents.
Also, a feature that was available in Marshmallow but missing in Nougat (and now Oreo) is the ability to make the Slim Recents tiles larger (not longer). I can make them longer, but not larger/fatter which was great for my bad eyesight.
Regardless, thanks for sharing the best recents app with us.