E1: the web version it is.

BBTUD on iOS

Play

Once you press Play, make it an app in fullscreen by pressing the rectangle with an up arrow on the bottom of the screen, then press "Add to Home Screen". Then open the app on the home screen.

⚠️WARNING: May crash upon entering a mode sometimes on weak devices!⚠️

E2: bro I had to change the bit ly to the regular link because itch io don't want it