Just annoyingly difficult. Nobody likes escort missions to begin with. But the princess needs to be way too close to you to follow you. I managed to make it to the boss but I have to give up now. It's hard even to tell if you're dealing him damage. And when I manage to lay a hit on him, I've always taken multiple hits just to do that. I'd have to grind way too much for max health upgrades and games shouldn't make you grind.
Good potential, but a lot of poor design. Too many jumps are way too exact if you want to avoid damage. some of those walls with spikes on top are like piranha plants that never go back in the pipe.
Also, there was a fatal glitch in the outdoor room with two buttons, the one that leads into the final castle. The middle button just glitches you out and kills you, and then you have to go way back to your last save point.