Sell app at a flat rate – Polygon: Paint Color by Number Review

I love the app, but on a fixed income I can not justify a weekly or monthly fee. Please consider a flat price and maybe sell special packs we can buy when we can afford. This is the best app I’ve found next to Happy Color which they sold for a flat price. Thank you for any consideration.
Review by TBO5150 on Polygon: Paint Color by Number.