Pretty happy user here as well! I actually used your source code as reference to build my personal site [redacted], so thanks for open-sourcing!

One issue I have with elderjs (with the version that I'm using - haven't been up to date), is that hot-reloading with rollup seems to cause issues with css. The experience is not as smooth as per say nextjs fast-refresh, but I'm content with it for my use-case.