I love that you have a browser version available! (Some of us don't use Windows.)
I managed to fumble my way through unlockables completion (but not achievement completion). It might be interesting to allow the player to increase the map size with research credits.
One frustrating part was how on the tech tree, when looking at <?> tiles; sometimes the requirement lines running from a source block to that <?> mystery block intercept through another block. Mistakingly thinking it's also a source block. (I spent ages trying to get desert desert and mountain mountain blocks to create what turned out to be mesa... realising it was meant to be fire, not desert.)
Oh, and the information of what resources effect which other resources is troublesome. Village has so many increases, that it cannot all fit in that one window. Also, Cliffs says it increases other Cliffs but that's not actually the case.