I used this plugin in combination with Better WP reCAPTCHA (BWP RC) and Contact Form 7 (CF7). Even after installing Google's public and private security keys on BWP RC, and installing the reCAPTCHA extension short code in CF7, the reCAPTCHA form did not appear on the front end of my site in development. It did however appear on the live site. CF7 with the reCAPTCHA extension hung up on my live site (caught in an infinite loop). I can't tell you if it was a conflict with another plugin, the theme, or my web host. But I was tired of dealing with a reCAPTCHA that wasn't working. So I switched back to an old reliable contact form plugin (with a CAPTCHA included); Fast Secure Contact Form.
Good luck gentleman in getting this plugin to work. Given that it's at version 0.1, I know you anticipate glitches along the way. If you are serious in developing the plugin further, you will eventually work out the kinks. I just don't have the patience right now to wait around.