Thanks for your feedback! We've talked to a few designers and it seems like everyone has a slightly different workflow. There are definitely people who manually save different files as you do and some more hardcore designer/developers who use git to manage versioning. We think there's a middle ground in between where you don't have to think about versioning and it just happens in the background.
We've hidden it in the demo but we've baked in collaboration as well. You can create a group for your team or even show it off publicly, a bit like Dribbble. The benefit of using Pixelapse is that you can learn how a design was created from start to finish. Like you said, not all designers necessarily work with other designers, but there's definitely collaboration and conversations with managers or developers or other stakeholders who may not be design/tech savvy. We want to save you from the cycle of exporting the psd, emailing the copy to a bunch of people, getting feedback and having to repeat as you incorporate the feedback. We're still thinking about different ways to expand and move forward and doing a Dribbble + Github may well be where we ultimately end up. :)
Sounds like you're aiming at teams and small ad agencies? Is that correct? I do like the idea of being able to share the versions as it progresses with other stakeholders. That is valuable. I didn't grep that from the demo. Admittedly I didn't poke around too much, I spent a few minutes on the site.
Is this for web design teams or mostly traditional media teams (Packaging, branding, print)? If the former, how do the developers work with it? If the latter, I like the functionality you've described.
I apologize if these questions and my critiques are too early in your dev cycle, I realize that you just released this (And it does look well polished!). I really just have an interest in this space and would like to see something work for my needs.