This specific version is often sought out because it runs on older hardware, supporting Android 5.1 and up. Because it is a fan-port, it often avoids some of the bloat seen in later unofficial versions, focusing strictly on the core "run and gun" mechanics and boss battles that made the original a Guinness World Record holder for the most boss battles in its genre. Comparison with Official Versions
If you want to experience Cuphead as a time capsule from 2021, before the hype of the DLC, 1.7.0 delivers a tighter, leaner, and arguably more punishing challenge. It lacks the variety of Ms. Chalice and the charm of the King of Games, but it makes up for it with a singular focus: two brothers, a debt to the Devil, and one hell of a fight. cuphead 1.7.0 original