It was well presented and a bit hard for me. Also, I didn't know you could only equip two things so I wasted diamonds on an upgrade that might have been better saved for the black market. I like the upgrade screen music.
Thanks for the feedback! There is actually a label at the Grand Bazaar upper right corner that says you can only have two upgrades equipped, maybe I could've made the text in different color so it'd catch the player's eye.