There is no route guide, nor should you really need one. Sileo is largely a linear experience. There's only one bad ending right now and it let's you rewind and try again.
Viewing post in Sileo: Tales of a New Dawn comments
Diego's and the very beginning of Tai's. 3 more days of Tai's route are dropping very soon. Be sure to check out the FAQ, all this information is already covered there: FAQ - Frequently Asked Questions! - Sileo: Tales of a New Dawn by Xevvy (itch.io)