Good take on the theme- the space limitation is instantly obvious, and it affects the gameplay. Other than that- I liked how you used particles and tiny dots (or should I say circles) in the background to make the graphics more interesting. Audio made the game feel old-school. Nice.
As for the gameplay... I think I didn't get it in full. I bounced, destroyed pentagons, and it all worked well, but I didn't feel like I had any plan to it. It felt a bit random to me. Then again, I played a couple of rounds. And it's cool you made a tutorial!