You should know platformer controls. ALL LEVELS ARE POSSIBLE!! All 85ish levels are completely possible. Apologies if the 3rd boss doesn't react to beating him. Just go into the project and reload, press play, and switch to the next backdrop after the boss.
Thanks to WatsonLJ for the man, this is not the same project as the first one. 1.0:World 1 done 1.1:Changed help menu and a few sprites. 2.0:world 2 done 3.0:World 3 done