Also, is there any real difference between the $16 and $50 tier? After all, excluding the kiddy adventure game, there's only going to be Moebius.
Yes, besides getting more games (including a second adventure if the studio gets outside funding, which Jane thinks is a possibility), $50 backers get more behind the scenes access (monthly video updates on the games in progress, copies of Jane's design bibles, beta testing, access to steamed launch parties with "Let's Play" sessions with Jane). And the $50 tier includes ebook copies of both Gabriel Knight novels, which are out of print and go for $50+ each on eBay.
Kickstarter won't let her edit the tiers, but she's included some text about this in the main description (under the info about Moebius).