Hey BDOsborne,
I really hate to tell you that I'm gonna have to reject this resubmission.
The theme is original, as we don't have any Mosasaurus-themed maps. The build looks really good. It's detailed and I can see that a lot of effort went into it. However, as the Mosasaurus is quite small it looks very similar to wave-themed maps we already have. Even though you slightly nerfed the parkour, it still is too hard for the medium difficulty, and would suit the hard difficulty better. The length fits the medium difficulty, the reason I can't accept your map as a hard map is because it would be too short. You do have nice variety in the course, and it is very enjoyable to do. Great job on that!
Thank you for submitting this map, I'd really like to see more maps from you in the future!
Have a great day,
Sil