Yes, to do a game like Worms. The level is a .png and when you shoot on the image, you remove a circle part. I need to access the image data directly at runtime and update the .png.
I started my game with Unity 3D:
consultationmagaliederouin.com/soupmouBonneAnnee/
But I can't make it work on IPhone without paying tons of certificates and licences. So Construct seems a good alternative.
Here javascript code for per pixel collision:
playmycode.com/blog/2011/08/javascript-per-pixel-html5-canvas-image-collision-detection/