Yes. While the base game is a paid product, the publisher offers free downloadable official content to enhance the game if you own the legal version:
Let’s get technical. Sol-Rui’s signature "after" sound is achieved by: Sol-Rui -after mini- Free Download
project). It is often found in community-curated collections or archives rather than as a standalone retail product. or help finding similar mini-games from the same developer? Sol-Rui -after mini- Free Download