Best wishes with your endeavor, Stephen! You might look at
this blog post on creating a Kickstarter campaign- it has a lot of information that you might find useful. As it is, your offering is a bit spartan, and I'm not sure if it will draw the attention you might want/it might deserve. Another thing that I see is that IndieGoGo seems to have changes so that the offering doesn't fail- you get all of the funds at the end of the drive. This does have less obvious downsides - if there's no goal, people aren't really pressed to give. The risk does give a reward. Just a few insights I thought I'd offer- hope it helps!