This is a very impressive Pitch. I was immediately hooked by your elevator pitch. I am a doodler and the idea of an app that would allow this style of learning to be stored, altered and reviewed is appealing. It is obvious you have taken a lot of time to prepare this pitch and the professional nature of both the elevator and venture pitch help draw an investor in.
I would need to sit down with the major competitors programs to truly see the differences available. I am familiar with OneNote as it comes standard on the surface computer. I feel your success will likely come down to your apps functionality at the a very specific level. It sounds like you plan on being guided at the early stages by user feedback so you may be able to out compete or be bought by one of the larger companies who are less flexible.
I would definitely invest in your company.