It'd be great if you could see your ship's health all the time instead of just when hit. Tends to get repetitive, could probably cut about 15-20 levels out. Level 60 - stay in the middle of the boss and lightning / short shield / other.
Takes away a lot of challenge when you can go through the walls. Also pretty sure I hit my own tail at least 3 times and didn't die. Score at end game is cut off to the first 2 digits only.
Some ideas: 1) Unlimited mode - so you don't start over at the same size on each level. 2) Fruit remaining until the next level. 3) Show the point of impact. My game over shows an empty segment in the middle of the snake nowhere near the head. 4) Level 6 either seems to be endless or significantly longer than the previous levels.