Interesting idea, it was sure fun to play. The brain character as well as the other sprites got me very intrigued in a good way.
Overall amazing game, It is easy to understand how it works, but some additional information on how to control the barriers and which elements need to be repeled and wich let pass would be nice. Then again, the visuals for each kind of element gives a huge hint on that regard, so good design job. Also, some feedback like score or level number would be nice, as I knew I was progressing through the game because more elements appeared on screen, but that extra info would be nice.
Great job, thanks for submitting such a cool game and hope you do well!