Perplexing Purple Puzzle

You control a purple ball, and your goal is to send it to the strange portal. The problem? There is a hole in a wall that is too small to get through. Solution: Lower your health with red triangles to fit through small passages. Another problem: There is one of those triangles on the other end of the hole. If you are too small when you go through, you will die. Solution MK 2: Green squares restore your health! There are also buttons that open doors. And a secret ending that fits the theme better...