Gave it 3/5, gameplay is ok, but no shop in this version, and the version on the site has this stupid shop idea with tokens. This guy needs to make a shop where you can sell what you've found and buy new items with the gold, it is that simple.
I hear you. There's too much grind involved. I played for days and never got any rare cards. And they are immensely overpowered.
3/5, the developer needs to understand balance.