This reminds me of Magicore Anomala, a side scrolling game being made for the 1985 Atari. I wish there was a way to know how people contemporary to the release of the Atari or the N64 would react to seeing these modern engines.

Magicore Anomala seems to actually be a sideview non-scrolling bullet hell game for the Amiga, which came out in 1985. Teen me owned one of the first Amigas in my city and the in-progress videos I can find of Magicore don't feel too out of place with the games I was seeing on it by the early nineties. It's moving around a couple of sprites and rendering a single-bitplane image of projectiles, and has some basic copper list tricks to get a 3-plane background image to have more than eight colors, which was pretty normal for the Amiga.

Here's a dissection of the title screen of Shadow Of The Beast (1989), for instance: https://codetapper.com/amiga/sprite-tricks/shadow-of-the-bea... - you can find a ton of video of this game very easily, go have a look.

Magicore is generally a bit zippier than most Amiga games, so many of them were kind of chunky and sluggish when I look back at them. Also the dev notes on using modern compression schemes that use what would be apocalyptic amounts of RAM and CPU by 1990 standards to crunch the data are amusing, but it's not like 1990 me wasn't used to chilling out for a few minutes between levels for a disc load, it was still worlds faster than the horrible load times of the C64 that was my first computer.

You know that 1985 was when 50-year-olds were starting high school right?