Earlier versions of the game were like this but it made upgrading too confusing. I still think there's room to differentiate but not for new players. Maybe for the second story I can incorporate some more differences btwn the colors, since everyone who reaches it will have beaten the first story
One thing that I really appreciate is that you don't have to log in every day for your daily rewards to be worthwhile. I am tired of games where forgetting to play one day after building up my rewards for weeks completely resets the daily reward.
it's nice that you can choose to upgrade cards instead of having to take cards you don't want or too many copies of the same card, but it would be nice to have some other way to upgrade cards.
Done! - it will work properly till next update