Standard Compose Multiplatform desktop applications bundle the JVM and Skiko, which can easily push your final installer size past 70MB–100MB.
If you want a sleek, ultra-lightweight desktop app without ditching your Kotlin Compose codebase, there is a brilliant hack: compile your app to WebAssembly (WASM) and wrap it inside Tauri. Tauri leverages the system's native WebView and a lightweight Rust backend, dropping your app's footprint down to just a few megabytes.