Made $1000 in pre-order sales with just a few tweets, without having an audience

I'm making a minimalist to-do app for Mac. I don't have an audience on Twitter and started without followers. I thought my post wouldn't have much reach because of it, but I was wrong.

My first Tweet got 10k views and much positive feedback about the product, with multiple people DM'ing me who said that they were excited about it. Here's the tweet:

So I rushed to make a landing page, launched a pre-order sale, and immediately started making sales. I made another tweet yesterday that led to more sales, and so far I have made 86 pre-order sales.

The craziest part is that this is my highest converting landing page ever. I've only had 312 visits to it so far, that's a 27% conversion rate. Here's the page:
https://focuslit.app/

Now I'm pretty much working all day to deliver it, so scared to disappoint people 😅 Excited about the future, can't wait to have a polished version of the product and start doing some real marketing.