I’ve added a power up to Arcade mode, that makes you twice as fast, invulnerable and drill faster. It’s entertaining because it encourages to make start frantically blazing through blocks that would otherwise be risky to destroy.
I’ve also started working on the second mode, “Certain Doom,” which is a Mars Miners flavored infinite runner. You’re in a tunnel trying to keep ahead of a lava wave, navigating metal scaffolding and breaking blocks (which improves your score).