EDIT: Thanks for the feedback. I agree with the criticism as a user. It was haste on my part as a maker. I made a quick fix now, by adding screenshots. Hopefully, they will give enough information for a test drive of the app.
Your website doesn't have to be the full experience, but it has to be enough to convince people the app is worth installing.
I always wondered why people think building an app is the best way to get users. Maybe it’s that a large number of phone users these days are used to downloading an app for a function versus visiting a website just to get sucked into endless notifications. Maybe it’s development preferences by the creator. Maybe we’re the odd ones out and people actually do download apps just to try them out.