Ahh, so exciting! I've got an appointment to run to so I can't give in-depth thoughts for now, but a few brief things I noticed right away:
You don't need to put the approximate cost of each tier in dollars! Kickstarter shows you that automatically in your local currency when you click to pledge.
You need a trailer. IIRC, the difference in success rates for projects that include one and projects that don't is significant.
Backer-only updates should be available to everyone who backs, not as a special tier! Combine the thank you/backer update tier.
Love the Lady's Maid tier, that's so cute!
Make a tier that has both The Rose of Segunda AND a copy of the sequel! People are going to want to get both in one go, especially if they're new to the series.
Make an early bird tier for the game (e.g. the first 100 backers get it for ten pounds, the rest for the full cost of the game). Both tiers should come with all previous rewards, which helps backers justify paying the game's full price for that tier. The early bird tier encourages people to back the game early rather than wait until the last minute to see if it's already been backed, which is important because people are more likely to back a Kickstarter that's already made a decent amount of money because it looks more likely to succeed.
More thoughts later! Congrats on putting this together and I hope it's successful!