Yo dude this is a lot of fun. It just needs an extra day of polish. It's such a simple concept and I like just blocking the snake and seeing where it'd go.
Admittedly in its current state it's nothing but a proof of concept. The snake moves slow and there's no way to 'speed up a turn'. Lack of music does hinder the experience a bit along with missing Quality of Life features like being able to drag to create stuff.
Still though, with a bit more time this would be something I would play here and then. I might even take the idea for myself if you're okay with it.
Other things I'd add is a way to see what direction the Snake is facing and also where it'd turn next when met with a wall, unless it being unpredictable is an intention (although I think there is a move priority coded in, right?)