It's different from a game store traditionally, I wonder, if you actually buy it for some price, if your purchase continues even if the dev changes the price. Cause looks like you buy the download, not the game itself when it's free...
If you pay money for a game while it is free then you will own it, even if a minimum price is added later that is higher than what you paid for.
Downloading something does not count as owning it though.
Good to know! Thank you!