Didn't expecting to get bombarded! But I think you could make the movement with all wasd instead of ad because it gets complicated sometimes. Great game.
Viewing post in Snake but Something Went Wrong jam comments
I've never played "snake" before, personally for me 2 keys for relative direction are better than 4 different keys for absolute direction, but I think I should have added an option to switch the mode, it's easy to implement and I had enough time left. By the way, if you know, do PlayerPrefs work in browser?