Love the clarity of this one! One shot, an aim line with a bounce preview, and atoms that fire their own electrons make the chain reaction theme the actual rule of the game. The green progress bar filling up and the grid transitions on clear and fail feel really satisfying, and the levels stay short and snappy. One suggestion: since a single missed shot restarts the level, a small hint about why the chain failed (for example highlighting the atoms that were missed) would make retries feel more informative. Great job!