It should be mentioned that this is technically a playable demo; however scoring, goals to reach the next level, etc. is already implemented so it is basically a full game at this point to me. I am not sure what else Stewart was/is planning to add; maybe boss monsters, etc.? Because of it's test status, it has a couple of test keys that you can try in the game; the A key will change background colours on the fly, and the C key will warp you between levels.
This is one of the most impressive game "demos" that I have ever seen and really is fully playable. Great job by Stewart, and I hope to see a "complete" version in the future.
Stewart also wrote a blog starting in 2017 that went through his history of game programming for the Dragon and into the development of Return of the Beast itself, including a lot of technical and coding details. You can start reading that here:
It should be mentioned that the game, as it currently stands, is pretty well maxing out the 32K of RAM it runs in. Stewart is planning to "finish" the game as a full 64K project, adding a bunch of things to the existing 32K version. Awesome!
Title: Return of the Beast (ROTB for short)
Author: Stewart Orchard, 3 channel music player by Ciaran Anscomb
Publisher: Stewart Orchard
Released: 2017
Requires: Color Computer 1,2,3, 32K RAM, joystick optional.