tech grappling hook - can attack to walls and pull you towards the walls
harpoon extends farther as you hold down fire, but no longer has auto-steering
mobs do 4% less harm per difficulty level
railgun/harpoon auto-targeting is smarter at long distances with multiple small targets
but it still has trouble with moving targets
booby trap only has a 100 -> 50% chance to drop a mine when picking up power ups
added fallback for browsers that don't allow local storage
1ca00d3598