It's just another Aurora, but simpler. The controls are sometimes difficult especially when changing the planet's speed and distance from the sun.
I would rather like to see something more original, you know. Why not making it 3D, coding dilatation of time? Just think about controls and you are ready to go.
Hey, how did you made this sling? I see you are probably using spring, but how do you make it, so that it vibrates in the middle for a first seconds after sticking?
There is only one think I don't like. It's the constant hum of flowing water I am able to hear everywhere.
If I were you, I would make the audio source linear and with the range of only 10. Water is heard even when there is no flowing water anywhere, when the pipe is fixed and sprinkler turned off.
You see that black area when going through the tunnel? It is the place, where camera does not render, because it is too far away. You need to change camera's Far Clipping Plane to higher value. If not, add a black colour fog, to hide that rendering effect.
And change black gateways to doors.
Due to the fog NOT covering up that effect at all; I extended the far clip plane to 25 units. Didn't change to doors; decided a good placeholder for now was some screenshots around that give some idea of what's on the otherside. Any other suggestions? I really don't think small graphical things will save this though; need some mechanics change to sway people over.
Thanks for the feedback :)