Advice for a First-Time Writer

Over the past year, I’ve been working on writing my first story, and I was wondering if anyone has any advice. So far it’s been well received, but I’m interested to know what’s specifically going well or what I can improve on for the next chapter. Pacing is one of the things I’m curious about. Thanks in advance! Here’s a link to read the story:
Give in to the Foam

It’s about a doctor’s assistant who gets drugged, captured, and subdued.