hello there,
I really like the idea when i first saw your post in Reddit, i have used it for a day, i wanted to provide some feedback in case you are interested.

The good

1. stack, very neat, hoestly dont know why this has not been explored in other file jumping plugins.
2. the ability to view the lines you marked in the preview just like how you would traverse a a stack when debugging
3. the ability to mark lines and the file
4. multiple stacks, for someone who doesnt really do much feature work, and a lot of jumping around in different context, this is pretty great

The bad

1. documentation of the api, i can understand as this is probably in its early stage to gather feedback
2. the UI is a little clunky, you can easily jump out of it, and not have a way to jump back in, you can accidentally close 1 with :q
3. not persistent, it would be crucial for me for them to be saved per branch/folder/project
4. not an easy way to cycle through the marked files in a stack without opening the UI

The nice to have

1. integration with telescope, i'd like to have a consistent experience
2. bufferline indicator, it'd be nice to know if a file is marked or not