This is wonderful!
Gameplay is really fun and challenging. I loved bouncing of walls, and the mechanic of using the tail to kill enemies whilst protecting the head. The telegraphed movement of the enemies was great - gave enough information to allow for planning, but particularly as I got longer it was still plenty difficult!
The sacrifices were nicely balanced, and I love "It looks cool".
I adore the visuals - the one bit style is really well utilised, and the snake looks amazing for such a visual design! Kind of reminded me of those worm on a string things with the pointy tip.
I found an odd quirk where A and D are inverted compared to Left and Right arrows - easy enough to work around though as I could just switch to the arrow keys which worked as I expected.