Oh no! The snake controls should definitely be working, that's not good. Just to double check - in the earlier build snake controls were mapped to the keyboard, but now they're just maps to arrow keys on the phone.
While that may help with emersion, the phone (and the arrow buttons by extension) moves a bit too much in response to mouse movement, making this control scheme too fidgety to really be functional for a quick response game like Snake.(EG: was going right, and wanted to go up ... phone 'overshot' and mistook it for press on left arrow, insta-killing the snake-session)