Trans-Temporter is the first sequel just finished, 27 August 2025 and uploaded to Free-eBooks here: Trans-Temporter.
It is shorter than the first book at only 72 pages long with just 12 chapters.
I had felt Temporter had further to go and I let the writing start dictating the storyline rather than setting out with the plot already known. After the first couple of chapters, I felt the plot form and it will need two stories to tell it.