Yes, I would have likely missed crescentblade's reply if you hadn't mentioned it, as itch didn't notify me, so thanks to you both.
And thank you, as well, for all the links. I was planning to have a look around and see how other people are doing things before I began, so you've really help me there - especially with the comments you've given on which parts you believe deserve the focus - so many thanks for that.
With the advice I'm getting from everyone here (thank you all!), with regards to tiers and rewards, I'm beginning to get a good idea of what kind of things are going to help make for a successful kickstarter if it comes to that.
Thanks again for the help you have provided so far - whatever happens, I can say have I been truly touched by the understanding and kindness show by everyone here. ^_^