You must first complete the game at least once. Then after return to all the previous levels that you gain a vechicle at. You'll get an upgrade version of that vechicle along with new levels that requires you to use it.
Unlockable How to Unlock New Levels Complete the game once then return to all the previous levels that you gain a vechicle. You'll get an upgraded version along with new levels.
To view an alternative ending you must first complete the game. Then play the final level again to fight a new boss. Defeat it and you'll see an alternative ending
To view a second alternative ending you first must complete the game once. After collect all 40 red gems in each of the new 40 levels unlocked. Complete the final level to see the second alternative ending.
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