I am not surprised, it was a kickstarter game that made it to early access on steam and became a hit due to for its time, quite realistic offroad driving physics, and a good coop. Sadly some internal issues rose between the developer and the publisher resulting in a turbulent time.
In the end, the developer stated to work for Saber interactive, the publisher licensed Spintires to Saber and Mudrunner was borne. Then Snowrunner followed. As of today, the offroad driving physics in Spintires are stil superior to mud/snowrunner.
The achivement music is from this band: