DriftKing 2D is available on Steam for $3,00 (Currently 75% off during the Steam Summer Sale 2020!) -Now 0,75
It's default price is also $3,00 on Itch.io in fairness of the Steam version.
But the option to purchase DK for $2,00 is there since there is no 30% Cut, Which is the result of not making use of the whole Steam ecosystem.
(Taxes not included to keep it simple and fair.)