Well i saw the negative reviews and I thought i would try it and go for a gamble and Im glad i did. I think people get ahead of themselves instead of taking a moment and actually reading the instructions. Upon opening the app and trying it out i also was unable to zoom...at least i thought i couldnt. BUT THEN something amazing happened. I read the instructions. In order to zoom all you have to do is tap the screen with two fingers. When the menu appears you can use those same two fingers to zoom in and out. Normally the two finger pinch gesture is preset to change the brush size i believe this is the confusion. Thought i would help and try to clear that up for some people before they give up on a, from my humble 5 minute opinion, decent app.
Ffghjkkkvgf about Asketch, v2.3.4