It's a 5 dollar game (being generous) that was already overpriced at $6.
Facts and opinions are different things.
If you don't like the game, or think it's overpriced, don't buy it. The dev should continue to price it as they see fit.
When AAA publishers price games at $70, the solution is not to buy it. It's not different here, except that $6 > $8 is not a difference most people (except the dev, due to volume) will care about.