Reloading the game causes multipliers to take a nosedive (like it forgets your cards or something) and also resets daily bonus progress back to the beginning. Not cool.
Screwed up camera movement makes this impossible to play on a trackpad. Keep it centered on the character, and quit making him move faster when you start clicking on him! It makes it impossible to heal him.
The color distinction isn't big enough for me. I have a really hard time determining just how much damage a shape can take because the color difference is so subtle. Maybe add a number to the shape so you can tell how many "hits" are left?
 "Idle Dice"){kind=icon}
 "Idle Sword"){kind=icon}
 "Idle Rpg"){kind=icon}
 "Polygonal Fury"){kind=icon}