Idk about you but after playing the game for a bit one will prob learn what the colors do, after all there are only 5. I do agree that the Wildcard description could be improved. When i first started playing it was confusing and i thought it switched up the powers of the tiles (instead of making both do both). Idk what to write instead but i am sure Anttihaavikko could come up with something.
And yes the game is fairly luckbased but a good overal understandig of macro and microstrategies is still required i feel like. (as someone who tryhards the game i always reset for a good start lol)