Very nice feedback on clicking, sound and atmosphere overall.
Clicking/Holding contradicts each other. I chose holding because it is kinda the same but easier. My strategy: upgrade automining to 10, then upgrade mouse holding to 10, then upgrade both to the level enough to finish the asteroid fast enough, but do not max them if not needed, because in that case game punishes you: money transferred to next asteroid but upgrades don't. So after having 1M transferred from one asteroid to another, the only thing left to do is to max out auto mining and mouse holding at start and wait a little until next asteroid.
Nice short game.