use gradle run to launch game
use gradle run --args='--debug' to run in debug mode (currently very limited)
use left-click + mouse move to steer ship
use W to accelerate, S to decelerate
use A to rotate counter-clockwise, D to rotate clockwise
use right-click to fire gun
use space to launch missile
use T to target boulder under cursor or under crosshair
tested with java 1.11
this is work in progress :)