I’d compare RftG more to a Puerto Rico or San Juan type game, just with a sci-fi theme, in that the cards are both used for tableau building and as currency. The vanilla game was (rightly) criticized as being a little bland and multiplayer solitaire’ish, but with the expansions it really opens up. There’s a lot of interplay between cards, different victory paths, and the app is very well done. My one complaint about the game is that you can get unlucky in your draws and end up with cards that do nothing for each other, but that can be said of any game of this type.
tl;dr - it’s a great game, you should get it