Very fun game, the music is amazing.
One feature I would recommend is to highlight the pass turn button when there are no possible actions, similar to Hearthstone. It lets the player play faster without actually helping them make any decisions and is generally just a comfy thing to have. Also I don't know if it's a mechanic that I missed or a weird coincidence, but it seemed like the shuffle was not working at times.
The deckbuilding options are cool and core gameplay is very good even if you've never played solitaire. Don't see any reason this won't blow up.