Wow that's a huge compliment, thanks!
I'll see what I can do for mobile marking. Maybe I can try touch-hold to open the context menu.
Yeah you are right I think annihilator achievements aren't filtering out balrog properly, I'll address that soon. Thanks for pointing that out.
As for more rewards I was considering locking items in the shop pool behind achievements too. Or go the rogue lite route instead and have power increases like "gain +$5 more" or "shops now have sales". Not sure im yet. If you get anymore ideas let me know :)