Sometimes they just take forever to blink.
I think just a few frames where the eyes are about to close would also help.
But the drag and drop feels good.
And a tip for the quit button. In the browser it just crashes the game so either leave it out (if you don't need a standalone version) or do something like this.
func _ready() -> void:
if OS.get_name() == "Web":
$Quitbutton.queue_free()