Enjoying the base of the idea that's here - and it's a nice 2D solar system simulator! I'd love to see this taken in something like a more puzzle-y direction with its stages, where you have to more carefully balance sizes and masses while making a solar system that doesn't collapse in on itself. What's here now is really neat, tho, and I def sent several planets into...Well, more "comet-y" orbits :P 

Nice idea and visuals!

Interesting Idea.
Some Feedback:

It would be cool if the win condition could depend on the stability of the orbits. You could just destoy planets on collision, and see if 3 seconds in the simulation all conditions are still fullfilled.

Also the lack of sound was a bit strange.

BTW. there seems to be a bug, where sometimes there is just no background image.

With a bit of polish, I think it could be a fun game!
And kudos on making all of the assets yourself!

It's not a bad Idae in itself but the fact it doeasn't matter how the planets look scale and behave is not important to mission as long as they are there is a bit disappointing. Wish there were some sounds in the game