In Level 5 I found only one secret area. I have no idea where others might be
When you complete the game it should be considered if lives that left shouldn't be converted into points. That way someone who will complete the game with one life will have a worse score than a person with three, four lives left (of course if we assume that they played equal).
P.S. How to obtain this triaton? (screenshot 1)
1. At Level 1, is it possible to go up, where this buddy is? (screenshot 2)
2. At Level 1, is it possible to kill the green alien? (screenshot 3)