Sometimes you hit those hidden home-brew gems. R0x Zero is such a game, it is developed by Tomchi, a French developer, who has produced quite some music and demos over the years.
The game is a shmup in the spirit of the demoscene, the music is exactly how you remember it from those days. Although it is a short game, it is very enjoyable. Quick responses and enemies are not too difficult, but can be tricky.
Have a watch on the below movie or download the game (link below).
More info: https://www.atarilegend.com/games/games_detail.php?game_id=7405