Update and Changes

New update with some gameplay changes and bug fixes!

- Added an easy mode: easy mode is slower, obstacles move slower, points are less, and player train takes less damage.

- Hard mode, moves slightly faster, faster enemies, train takes more damage, points are worth more. Extra bonus points for completing the run.

- Added separate high scores for easy mode and hard mode

- Added Continue or Quit option during crash out screen.

- Green tractor enemies shoot cobs of corn, Red tractor chases the player train.

- Boss encounters last a little bit longer.

- Made screen title match the box are more.

- Added a final score for the end of the run, and extra bonus points for less crash outs.

- PC standalone saves high scores when game exits

Fixes:

- fixed bug where some traffic cars would sometimes disappear randomly

- fixed some color palette issues on some stages

- changed the blue sprite color on obstacles to be more vibrant and standout more from background

- improved the movement routine on some of the enemy cars.

- fixed some background errors

- added some code optimization, and cleaned out some unused routines