I quite enjoyed the game and the varied use of the proportionator ray, however I feel the game was held back a bit by awkward camera and obstacle placement - often an obstacle was placed right after the screen transitioned from one position to the other, which made it hard to see what you were getting into.
The long respawn time also made repeated attempts harder to do, as I had to wait what felt like more than a second between every attempt.
I did however really enjoy the good amount of juice you added to the game. Using the proportionator ray felt satisfying and I loved the little "bounce" that objects made when they grew. Great touch!