For those who have unvote this comment: please don't. Don't forget that 20$ is not the same everywhere and it can be a lot for people living in some countries (or simply for people who don't have a lot of money).
@VesuEms: I will make all my asset packs for -50% in a few months. Not sure when exactly yet but I'm planning to. So keep an eye on my Twitter if you still want to buy it :3