These look really nice @Alex - great work.
The hexagon as a stroke seems a bit too far for me. Keep in mind, we need to think how this logo can extend past simply standing on it own on a website. We need to think through variations for platforms like GitHub, Gitcoin, press releases, stickers, print, etc.
So the hexagon looks great but keep in mind all the various situations it must be able to live in. This applies for color as well. Do these color palettes lend themselves to print?
cc @Ned