Other thoughts: the main characters background being a liberal arts graduate seems a bit specific, not that it's bad. My first impression is maybe something simpler or more vague would be better. Maybe he's just a graduate, type unspecified. I don't know the background behind it, maybe there's more to it in your storyline or a personal reason for specifying they type of degree. Anyway it's just something that stood out, nothing wrong with leaving it as is.
The movement speed of the main character probably could benefit from a small increase. Also a nice feature would be increased movement while hovering with the jet pack, at least horizontally, if even only slightly.
The jetpack looks like a lot of fun, try not to limit it's use too much(like limited fuel), I think everyone will really enjoy it from the looks of it (I don't know your plans with the jet pack).
I have not looked at the promotion materials yet (very interested now and should be able to look tonight) but I just wanted to follow up with my opinions on the above points.
From a story perspective, the more vague the character is generally the better as it allows the player to immerse. "This could be me" unless the specific character matters due to interactions with a specific other character (wife/girlfriend/former colleague).
For the jetpack, I am not sure what you plan to do, but making it have a recharge system related to time or movement (and being able to pick up fuel or batteries as well) could really help to make it more usable, without making it usable all the time. It would also be great to see greatly enhanced movement with the jetpack for those crazy speed running types and for more variations in the gameplay.
I plan to look in more detail this evening while I am home, but just from the few things I have seen on this thread, it looks exciting!