Neat changes, I think they help the game.
The particles - I think they look decent - certainly help sell the idea of eating something.
I think it would be really cool to have a bulge when travelling through tubes, but that might be too much work, given all the bends, etc.
If I were to change something else it would be the splat animation - the few frames don't sell the idea of a splat - this could be overcome with a sine behaviour set to size and a fade that's about half the period of the sine - that way it kinda grows - pow! - and fades out nicely (perhaps starting to shrink a little, like something squashed would).