Fall from Space Demo v0.62 (minor updates)

As sure as night follows day, I'll immediately need to push out an updated version of the demo after an update. Always too hasty.

Anyway, some tweaks and fixes –

• Minimum jump height (actually works properly)
• Knock back from enemy (as above)
• Roll and step more solid if spammed (could previously lose orientation if done rapidly enough)
• Tile overflow on first scene was introduced, now removed
• Still quote screens are no longer timed to give people longer to read who don't have English as a first language, or just need a bit more time to read/ponder (B or Start progress)
• Wurms dropping from ceilings can now be punched in mid air, before they land
• Ship launch sequence improved slightly