Mmmmmh ... Sometimes going left/right is blocked and I cant figure out why that would be. This hinders evading some dynamite packs. Can ya doublecheck if the update method correctly checks not only for the moment we press the button but also for holding the button pressed?!? Otherwise, nice start! I recommend playing around with the gems more (upgrading the teeth automatically with gems. Higher upgrades = faster dig speed. Start at lower dig speed)
nice start!