Slay the Spire 2 has quickly become a standout success, despite initial observations from some critics that its early access version closely resembles its predecessor. The development team, Mega Crit, plans a full release within one to two years, following a remarkable launch that saw over three million copies sold in its first week.

This triumph is particularly notable given the circumstances surrounding its development. Mega Crit transitioned to the open-source Godot engine, a move prompted by Unity's controversial policy changes in 2023. Unity had attempted to impose a per-install fee and a 'runtime fee' on games utilizing its engine, leading to widespread condemnation from the developer community. Despite having invested two years of development in Unity, Mega Crit announced its intention to switch engines if the policy changes were not fully reversed and proper terms of service protections put in place. This decisive action underscored the gravity of Unity's misstep, demonstrating the deep dissatisfaction among developers.

Although Unity eventually rolled back some of its changes and its CEO stepped down, the incident caused irreparable damage to its reputation, particularly among indie developers. Mega Crit's successful pivot to Godot, an engine freely available under the MIT license, serves as a powerful testament to the viability of alternative platforms. The studio even created a small game, Dancing Duellists, during its three-week evaluation of Godot, encouraging donations to the Godot engine's development fund. This transition exemplifies how developers can thrive by prioritizing community and sustainable practices over potentially exploitative business models.

The story of Slay the Spire 2 and Mega Crit's bold decision to switch game engines illustrates a crucial lesson for the industry: prioritizing profit over partnership can lead to significant losses. Mega Crit's success with Godot proves that innovation and developer-friendly ecosystems are essential for long-term growth and creativity in the gaming world.