Occasionally the whole display flashes, vvery likely because of this game. A few times the flash made the game and a video in another tab to appear as a bunch of frozen black blocks. Never happened unless this game was open.
Prestige system (go deeper?), relics that take time to mine and are very rare (buy something extra with them), random floating stuff for more active players (clickable 'coins' etc), selling reduces price for a certain period of time (more sold, bigger the price drop and duration), balance the endgame so the gap between completed upgrades and tasks isn't so big, pick a race at the start and each have different bonuses (dwarves mine slightly faster, goblins are cheaper, gnomes mine harder materials faster etc...)...
There's a few ideas. Nothing too original, but I suppose you could change something in them.
Horrible game! Graphics are so messy it's hard to see what's on the screen. Most of the time I have no idea where I am flying. It's like trying to find the best half-digested candies from a vomit.
Ha ha, I briefly considered adding an achievement for that...