This was damn cool. Watching and listening to it I wonder what is the hardest. Producing video with a sound chip or producing audio with a video chip. Fun stuff.
I like good pixel dithering. The C64 demo scene has become really good at it. Just look at the girl picture in the frozen start pic. That shows really good taste in picking colors from the weird palette too.
It's funny how Denmark could produce two computer scientists with very distinct opinions on what makes a computer language good (I'm happy ate least one of them knows the right answer)
OTH it's impressive what you can do with multiple AYs when they have a dedicated CPU to drive them. For instance the Bomb Jack arcade machine has a separate sound board with 3x AY and a 3 MHz Z80 CPU and it sounds pretty nice:
Here's Jochen Hippel's(Mad Max in the Atari ST demoscene) use of the AY's on the Guryss hardware(x3 AY). It's a quite lovely tune. They use timers to make "buzzers" and "SID-sound".
Years ago I had iPhone 3GS and iPhone 5. I remember being amazed how fast I could type on it. Today I simply write "I'll write a better answer on the computer later".
https://www.youtube.com/watch?v=ZAud8w5mTa4