Nice visuals! I think it would be helpful to have something that explains what the player is supposed to do, but I figured it out eventually. Also since you're racing against the timer, I'd make the timer much larger. Good work!

Quite a small game, but pretty cosmic art design.

It's a bit straining to hold the mouse button all the time, so maybe you could make the character always move towards the mouse (and stand still when the mouse is placed over the character.
It would be nice if the lunar dust was placed randomly, and if there were some powerups to collect.