One thing you should definitely try if youre gonna rehash this is to make the jump more springy, mostly in the character model. Make it stretch like you have already, but then when you release, really make the snake spring back into a smaller but wider shape, to really get a sense of propelling upward. I would also make gravity a little bit more arcadey, and make the base shape a little bit rounder to make hitbox detection more readable. This would make a good casual phone game though, definitely worth a rehash