hey, thanks for playing! currently the two upgrades are all there really is to collect in the game, and yeah, it's pretty easy to OOB right now since we're still in early development.
some of the screenshots are actually from levels that aren't in the build yet, so no worries, you likely didn't miss anything. and yep - the main purpose of the second upgrade is to upgrade your vision so you can see the color green.
thanks again for playing! we're working hard to add more to the game, so hopefully there'll be more to see soon - we have a milestone in march and another in april, with an alpha due by may. i'll update the page with this info as well!