I've played with it, and have written a basic fasta/fastq bioinformatics library in nim (https://github.com/jhbadger/nimbioseq)

What I find appealing is that seems to reach the goal of "a compiled typed language that feels like a scripting language" more so than other similar languages like Kotlin and Swift. There is just so little "boilerplate" code that always seems to have to be included in compiled languages and yet it seems to generate decent smallish binaries (via C). There's also a Javascript backend for web development, but I haven't used that.