Just been listening to the end tune in RMT... good way to evaluate game/demo music is do so in a detached form, let it live only on it's own merits:
. as a technical feat, uses stereo and probably near nothing in the way of synth tricks. Probably nothing in there that hasn't been done technically in the last 5 or maybe even 10 years.
. as a musical feat - Wow factor=maximal. The emotion and atmosphere generated by this song is rarely matched by anything on the Atari. If a list of the best 10 musical pieces ever done for the A8 was done, this would have to make it.
This subject has come up before, probably >5 years ago and I was one of the ones advocating more effort towards games.
The last few years I think we've had a healthy balance with at least 1 or 2 "epic" games per year and overall probably more "complex" games than demos.
The thing with a game is you can have the polishing and fine-tuning of gameplay elements that might take near half the development time. With a demo, since it's a scripted type thing with little or no participation from the outside it can be a much quicker process doing those things.
Powering up and the screen staying static colour means the OS can't initilize and plenty of things could cause it from failed CPU to bad Rom or Ram or a failed Antic. Or it could be something as simple as one of the 7400 series logic chips that costs about a buck to replace.
An easy way to test if you don't have equipment like logic analyser is to swap in chips from the bad computer into a known good one at a time and see which ones don't work.
Main ones to test would be CPU, Antic, MMU, OS Rom, Ram chips.