What do you think of my alternative to CAPTCHAs?

Hello the Verge readers,

I wanted to get some people's opinion on my university project and get some real world testing. I thought this is an appropriate forum to post to, if not please inform me and I will remove the post right away. So, what is my project? It is a gesture and image based CAPTCHA system. As a user you are required to draw a circle or another shape over a given image, and that is it. No need to type. This is oriented more towards touch screen devices or computers with mouses. It is not aimed at keyboard only use or devices with small screen. You can try it out at picaptcha.me .

I would be grateful if you could complete a little survey here. It should take you less than a minute. You can leave any comments in the survey or here.