Great game! I just have a few suggestions:
Make the conveyor movement slower.
If you're moving forwards, on a conveyor going backward, you should be moving forwards, even if it is a lot slower.
Make the dialogue text move from the top to the bottom of the screen depending on where you are standing.
This would be easy to add if you just check the y position of the player and then move it out of the way.
Don't repeat voice lines.
I think this one is pretty self-explanatory
Apart from that, awesome game!