Apple II Lo-res Escape, won 3rd place Retro Demo at Demosplash 2019.
Entirely in 40x48 x 15 color low-res mode. The various 40x96 and 40x192 sequences are done with beam-racing and cycle counting in 6502 assembly language.
Sound has issues on real hardware, sounds much better in an emulator for some reason.
More info: http://www.deater.net/weave/vmwprod/lores_escape/