A: the dearth of dynamite device debuggers

B: diagnose a defective dynamite-based digging / drilling device

C: 

D:

1. more than one sound
2. some kinematics animation (moving along a conveyor, falling)
3. some sprite-sheet animation
4. more than one level
5. an in-game tutorial
6. a win screen
7. a splash screen

Note: fun is not on the list