Nice

This was a lot funnier than I had excepted :)

Keep up the good work.

Nice

that was awesome :)

*Spoiler Alert?*

While this game does have an interesting sad mood to it it feels like this "idea" would be more suited for a medium like a short movie as opposed to a game.
I mean, you don't really PLAY at all, there aren't any decisions to make. You just hold down "D" and tap "W" once in a while.
It also felt like it didn't really build up to anything, the story told isn't very deep and the way your character moves makes the cliff jump feel very undramatic.
You just keep on waddling right on off.

In summary, I thought that the mood was good but the second half of the game didn't really add much and it wasn't much of a "game".

Pretty good

It's a good explanation of basic physics.

My only real criticism is the way you handled the circles radius (by adding an invisible outline to all other objects), I just found that this was a very in-elegant solution because it only works as long you only have 1 sphere (or more if they ignore each other).

Apart from that , very nice tutorial.

Very nice

Awesome

Sounds great

Awesome

Great song.

Is it ok if I use this in a game I am creating?