This was fun, I think small tweaks could do a lot - maybe adding more story to the end once you reach the hospital like "thanks dinosaur for saving the world" kinda stuff, otherwise just using pitch_scale on some of the sounds to make them less repetitive. This is really simple to do in Godot like:
"pitch_scale = randf_range(0.95,1.05)"
This was a really good infinite runner game, well done and congrats!