Cool game idea! I think we started in a pretty similar place with our game, and it was really hard to control two snakes separately...
It would probably be a lot easier as a 2 player game. I think one thing that made it really hard for me was that WASD controlled the snake that started on the right, and arrow keys controlled the left snake...which is the reverse of how it is on a QWERTY keyboard, so I kept mixing those up.
I love the aesthetic/glow of the game!