That was an awesome little game. Congrats!
There's so much stuff there! Upgrades, map, drag and drop, holy.
My unique minor improvement here is that the UI could be a little bit more polished (e.g. when you select a mask as a reward, for example, you already display the message that it must be dragged to the character for it to be used, but, until you finish the choosing part, it can't be dragged), but like, besides that super minor specific stuff, it's a hell of a fun game. Congrats!