Ramps provide a little bit of leverage against oncoming enemies but they also can be traps, so tread carefully. Ramps normally lead to a few specific things: they can help you gain enough height to gather a series of coins or souls, or they can lead to a skywalk that may not be reachable otherwise.
Skywalks can come in a few different shapes and sizes. For the most part, these skywalks give you the opportunity to gather weapons and/or powerups. It is safe to say that the more complicated the skywalk is the less safe the skywalk actually is. However, just because it’s unsafe doesn’t mean you shouldn’t use it. Complicated skywalks often contain special weapons and/or powerups, so with high risk comes high reward. It may also be rewarding in the most important way simply because of the fact that ghouls and bats tend to be in these locations. Ghouls and bats are both mid-level enemies that will score you a decent amount of points after each kill. If your goal is to get the highest score as fast as possible, these dangerous routes can be fruitful.