Maybe it's just me but in general crafting menue's coloring wasnt obvious at first.
Like you said, I see green blinking thing, I think of cursor.
so I was wondering, when using arrow keys, why the blinking thing wasnt moving.
if it where me, I would prefer for a solid green for already bought stuff.
the current "cursor" is okay as it is.
Also just didnt realize at first, that there is a menu on the right where I would first have to choose upgrades before I can move the cursor around in the upgrades.
maybe only my taste but have the menu on the left side and the upgrade icons on the right.