Just wanted to quickly shout out that I really love the idea and execution. Have not used it but went though your materials and presentation. I plan on using this soon. Conversion from your landing page should be fun and not this annoying pop up in the middle of you window why you reading makes me instantly less wanting to read anything from that page.
As mentioned in cons, various forms of gamifications (for various target audiences) seem to me the key feature for to future to make or break this. Also, since such little games also get old quickly, you do not want to have the same as somebody else in your niche.
Great work! Keep it going.