~ The early warning system with the red arrows helps. You know if a hunter is coming, but most important, you know if a bone is about to be stolen, which you can't see from above. Losing a bone also burns off your health.
Once that warning system stops, you don't know what is going on below and if the hunter is just off screen.
~ Dig time is decent, but it would be cool if you could "upgrade" the skeleton and other things. Maybe the mage does more damage.
~ Tombs breaking seems fine to me. It makes you have to move.
~ Health loss being permanent makes the session very hard to keep going, especially with only 3 of it.
~ There is no saving of high scores or the active game you are in. Would be interesting if the dark door underground had a high score system in it.