The First 15 Minutes of Neo XYX (Dreamcast)

Copied from MobyGames:

Neo XYX is a vertical shooter with a hardcore sci-fi theme greatly inspired by Toaplan games of the 90s. It features an intricate scoring system based around collecting medals dropped by enemies after their defeat. As players collect medals, the score value of each subsequent medal continues to climb as long as the chain isn't dropped, leading to high-risk scoring opportunities.