This is really nice, great job! I built something similar for myself on MacOS recently. Started off as a window manager then began adding keyboard navigation features as I was unhappy with other tools (vimium, shortcat etc).

Hint mode as a feature being able to click all active links on the screen is great and very useful.

Two features I've added recently that have made never using a mouse much more feasible:

1. Search mode - Search for any text on the page, jump to it and then use vim keybindings to select text from there and copy => I use this 20+ times a day

2. Scroll mode - Any scroll area on the page is highlighted with a hint, but when selected it clicks the scroll area and allows you to use keybindings like j/k/gg/G to scroll up and down. I loved this from vimium and wanted to everywhere

Feel free to steal those :)

https://github.com/andyhmltn/nflow