This is quite a fun puzzle game with a neat idea.
I like the progression of the difficulty. Every level introduces a new mechanic and teaches you how to handle it. Although I think difficulty spikes quite a bit on the last level. A few more levels that use all of the mechanics would give then a room to breeze, and would let players catch up on the nuances they missed.
Graphics are quite nice. I would like to see a bit more visual feedback to player actions. For example, it’s not immediately obvious if you need to bump into the symbols or just move near them. And sounds, obviously.
I actually quite like the setting of the game, with emotions and stuff, but I don’t think it really conforms to the theme. Both alchemy and shadow aspects seem to be tacked on.
Which would be fine if your own theme of emotions was expressed more. Right now I’m just matching colors and there is some flavor text I guess. But it would be better to see some visual effects that correspond to emotions. Maybe screen shakes and turns reddish when you are “angry”, or ball moves slower when you are “sad”. Or at the very least show the name of emotion in english somewhere.
Overall, great job!