As for pacing, I like to be able to build an engine and set it to work. I should feel like I'm making progress. This game required you to put it on in the background and wait. The Quartz is just too hard. Leaving the game up for a day and coming back to it, I was able to buy upgrades with sand that made almost no difference. Getting more stone or sandstone is useless after you can mine it effectively.
Being able to use bombs in succession without having to click each time would drastically increase it's use.