I've been helping with a small portfolio of Slack apps under the brand https://happybara.io, including Nightowl (multi-DM broadcast for Slack, like BCC for email), and Channitor (channel management & auto-archiving).
It's been a really interesting journey making mistakes & learning from them. One mistake that made me feel foolish: I assumed no one would ever pay for one of the apps. A paywall was added "just in case" -> boom, customers almost immediately started signing up. I felt incredibly silly after that, especially for the number of times I've read on HN and similar sites "your work is valuable" and "charge more".
This is cool! I looked into building a slack app myself, I'm curious: how are you liking the slack store and its policies? Was starting out difficult? I vaguely remember having to have your app installed in multiple workspaces already before being listed in the store