I currently primarily play on my iPad, my Nintendo DS and my computer which now runs FreeBSD. Most Visual Novels for Windows will work on FreeBSD and Linux without too many issues when running in WINE but sometimes older ones with custom engines or newer Unity-based ones can require special tweaks to get going. There are a small handful that won't run at all but most are solid, especially those made with Ren'Py or Tyrano Builder. I haven't found too many mobile ones that I enjoy so far, though.