I played it and I enjoyed it.
The pace of the game and the difficulty level was balanced very nicely. Naturally when player would get comfortable with the movement and the goal of the game, he would find himself a bit bored after a while, but the introduction of faster shrinking created two separate objectives for me: Be quick and think unconventionally to pass the level.
During last 2-3 levels I tried to either be extremely fast and mash player to everything upon spawn (the shield mechanism which prevented you from dying was good implementation) or to actually wait for the universe to shrink so i can simply let wormhole come to me, which actually didn't prove to be a bad idea.
Overall I liked the game. I was thinking about your intentions for the camera movement and player navigation in space, if you did intend the behavior, I agree with your decisions, because ultimately I think it made experience even more enjoyable.
Well done. :)