A bit of a rework to the main and pause menus to enable navigation and selection with the keyboard and gamepad.

0.5.5a

• Slightly lowered player acceleration to make you less slippery.
• The Pause menu + main menu can now be fully navigated by both keyboard and controllers.
• Player jumps can no longer be buffered in the pause menu.
• The player no longer changes direction if movement is pressed while paused.
• Added a few platforms and enemies onto “level_1” to test some basic platforming.

0.5.5b

• Fixed player movement being disabled if they go back to main menu and then play again.