The video game engine developer has a new leader and a new strategy.The stock chart for video game engine developer Unity (U 2.69%) sure doesn't look pretty. Since peaking in late 2021, shares of Unity are down nearly 90%. Once valued at more than $50 billion, the company's market capitalization has fallen to about$8 billion.A lot has gone wrong for Unity over the past few years:A highly acquisitive strategy, which saw the company shell out $4.4 billion in stock for app monetization platform ironSource, ha ...