Never added saving or loading. If someone else wants to make it in another language, be my guest.
Controls (at least, the ones I remember):
1-9: Change the size of your placed planets.
0: Drop an object at a velocity of zero.
-: Create a negative matter planet.
=: Create a positive matter planet.
Q: Toggle the grid.
R: Redraw the screen without clearing the object trail.
D: OVERCLOCK MODE!
G: Toggles movement of planets. I never really liked this because updating the damn screen is too slow.
C: Redraw the screen, clearing the object trail.
Up Arrow: Launch a fast-moving object upwards.
Spacebar: FIRE CLEAR EVERYTHING!
Other arrows: If I need to explain this you don't know how to open programs anyway.