Really cool game! I love the ragdoll, and it's cool how the black hole can consume their arms and legs, but the astronaut is still fine. One thing to be careful of tho is safe spots, as you can actually hold the mouse in the top right corner of the screen and survive forever. This is obviously a boring way to play, so it's important that you design the stage to avoid safe spots. Perhaps make it so that obstacles can spawn slightly off the edge of the screen to eliminate this strategy?
Otherwise the game was pretty well done, I like the art, and can only wish for sounds and music. I love the screen shake, it was a nice bit of polish that made it all feel a bit more alive. So good job with the game, and especially the art; you deserve a lot more ratings than you've got but at least you reached the 20 ratings mark. Glad I got to play your game =)