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As it stands now, it's mostly a tech demo, using sprites from Tyrian.

Basically, I figured out that, since most of Tyrian player and enemy sprites are 24 pixels wide, and most of the shots are 16 pixels wide,
it should be possible to show a single enemy, plus the player, plus a single shot on a single scanline without flickering issues;
so as long as as the enemies move at the same speed, are spawned at intervals that prevent them from overlapping their Y cooordinates and are
restricted to only move horizontally after being spawned, and the same restrictions are applied to the shots, it should be possible to use them on a
Sega Master System without resizing, only reducing the color count. This is an experiment to test how it would look like.

hang-on wrote

Nice! Even though I'm not super much into top-down shooters, I personally think this is the type of game the SMS hardware handles the best. I like how you take the VDP limitations into consideration to counter sprite flicker.

If you find the time, I would like to read about how you have programmed the animations. Do you use a kind of animation script struct? In my head, I can only come up with overly complex solutions that I have a hard time implementing...

sverx wrote

there's surely no sprite flicker, and everything seems to work fine
so bad you didn't code any collision :|
let's hope you'll continue this project.