I finished all girls story and now slowly trying to level up my card game and not sure if there is other way to do it faster, there is no mention that selling cards gives u exp. Now at level 22 and for some reason cant open a gold pack? I have $770k but when i click nothing happen. Is harley story complete? I am at level 5 3 stars with her but nothing progress. For the next updates i am afraid i need to throw away my save which is sad. For the card game i found having 5 cards deck with highest number is the easiest strategy with taking bonus into account. Maybe add a 1 value card and use the gum for third round finisher
If not already, I'll add a little note about selling cards giving you exp in the tutorial section.
Gold packs aren't available yet in this version but will be eventually.
Harley's story will be complete in Version 0.13 so if you're sticking to free, public version, that'll be out mid-June.
Don't worry about throwing away your save file. As long as you keep it and update the game, we provide an 'update old save file' system that lets you use your old save file and update some things to minimize bugs for the new version.
Glad you found a deck-strat that works for ya!