The game is solid. The miners are only animated. They didn't do anything horizontally, except when going down a level (on the browser). It would be nicer if they actually helped horizontally.
It is suggested that the ability to zoom in should be added for visual accessibility. And we may also appreciate the animations better. The deeper levels become darker. Higher contrast is not required for me here, but it would be appreciated - the current contrast in the darker levels is still marginally acceptable.
I managed to finish the game and ascend to the top again. It is quite fun :)