Retrobooster is a reinvention of the cave-flyer genre for players who love skill-based games. You control an extremely responsive ship, which opens up new possibilities for speed flying challenges, puzzles, and bullet hell scenarios. At its core this is an old school action game, plus updated visuals and audio and new types of levels. This game is set at 1980s difficulty--not just the flying and shooting but the puzzles as well. Survive it if you can.
This is the Retrobooster Demo for Windows in a .zip file. Unpack the .zip file. Then double-click retrobooster-demo.bat.