While the desire to play Cuphead on an Android phone is understandable, the "Cuphead CDV 251 APK" represents a dangerous shortcut. The potential costs—security breaches, data theft, malware infections, and legal ambiguity—far outweigh the benefit of playing a few levels for free.
Open the CDV 251 (or similar) APK file on your device and install it. cuphead cdv 251 apk