Ever since I started using K/N, I see the Gradle "Damon will be stopped at the end of the build after running out of JVM memory" a lot, even when I'm just compiling fairly small projects.

Depends your project. If it's complicated, it might allocate more than the default heap. You can tweak that with

org.gradle.jvmargs=-Xmx4g

It's a single main.kt file

I don't know, K/N might use more memory

Literally just the Kotlin/Native template when creating a new JB project with a slight tweak