Hey there. I am glad that you are appreciating Euclyca. It was made with a lot of effort and passion. Euclyca Tactics is a one off game that has no story and is very short. Euclyca is part of the Noun Series and is unofficially known as Solenars Edge III. The Noun Series includes Euclyca, Exiori and Elruna in that order. https://syukino.itch.io/exiori
Exiori comes with Elruna for free and continues the story of Euclyca, but with a focus on a different cast.
Exiori both takes place during some events of Euclyca and after the events of Euclyca. Elruna takes place completely after the events of Euclyca and Exiori.