I'm not actually sure if the product _and_ company are named flowy, or if the company is flowy and the product is named talksik (from the screen recording). Your post here doesn't clarify, but I will stick with flowy for this reply.
Though I think that you'll have some difficulties in getting sales (who knows I might be totally incorrect). I say that for a couple of reasons:
1. I think with only 24 hours of history it is somewhat limited, let's say I work in Boston, what about the Friday afternoon message that my Seattle colleague sends me as I'm finishing up, I'll want to replay it on Monday morning but it won't be there. A save for later function would be helpful.
2. Let's imagine I am a potential investor, I ask you "what does flowy have to offer if Slack implements a voice message feature?" What is your answer? From your website I honestly don't know, sure it's not Slack, so there are no Slack channels with hundreds of people and that one person who hits @here, and at some companies Slack is like a social media network without the moderation or block button. But Slack offers a lot, a rich ecosystem of plugins / bots for one.
3. Slack (and Teams et al.) offer a written history (leaving aside the caveat of the edit button for the moment), if I forget the specifics of what my colleague and I agreed on last week I can go back to Slack and read the message thread, if we use flowy that history is gone without transcribing the message.
One place that I can see this tool being somewhat useful is as a secondary mode of communication between a handful of engineers. Numerous times a week I consider uninstalling Slack from my work laptop, but that would leave my close colleagues high and dry. flowy _could_ be a useful tool in combatting that. Though given that a company is already paying for Slack / Teams etc. they would rightfully be hesitant to purchase a subscription to flowy.
I am glad to see that you have screen-sharing included already because that is so integral to so many peoples workflows.