Then I went ahead and tried it out... mind blown. It's that good. Feels like a native app in it's UI quality and speed. And $9/month is a very good price point, especially for those that regularly create vector art.
I'm amazed at the quality of your app. It'll be especially incredible once you're at Inkscape parity. How large is the team you got working full time?
BTW, the widget toolkit used by Boxy SVG is open sourced and can be used by other projects. You can try it out on https://xel-toolkit.org. In near future I'm planning to improve it by adding Windows 10 theme and full support for color schemes and dark mode.
Everyone on earth wants to turn a sale into a recurring revenue stream for a reason. Trivial individual costs add up substantially over time.
i clicked on the link of your site, and the first box i saw said "9$/month". that's enough to click away (for me).
only after i did some more clicking and followed an external(!) link to the store it was obvious you can do a one-time purchase.
in a normal situation i would never have gotten to that point and would have clicked away immediately after seeing 9/month for a new product that still has to prove itself and doesn't have a big name behind it.