It might be cool if you made the values for jumping and moving climb quicker so they became more out of control sooner. With the way the lava rises, the values only go up in a small enough increment that they don't really feel chaotic. Also, after a few rooftops, it didn't seem like there was anywhere else to go, not sure if this is procedurally generated or if you set up the level, but options for direction would have been nice.