Very worthwhile. I would only suggest releasing a single or dual frame as a demo download. TO see if the format matches the resources they are currently working with and to ensure these are compatible with their game maker of choice. With pixel art a renpy visual novel will need many more backgrounds. But a game maker or rpg maker game title will benefit from this asset pack. By using a series of backgrounds one becomes committed to the style, which means somebody will likely have to have plenty more backgrounds all in the same style to be able to continue on their project. If you intend to continue it would be helpful to eventually release themed packs (Summer/winter, day/night, rain/shine) for different tones of games.