How much did the indie game "Cave Story" cost when it was first released in 2004?

The indie game Cave Story was initially released in 2004 as a freeware game and therefore cost nothing to download and play. It was developed solely by Daisuke Amaya, known as Pixel, who worked on it as a passion project over a span of several years. Pixel's decision to release the game for free was fueled by his desire to share his creation with others, and this choice played a significant role in its success and widespread popularity within the indie gaming community.