Very well done, I've wanted to make something like this for years, alas I'm too lazy xD 95/100 for sure.
Very well rounded map, good terrain, unique building styles (for hermit crab), unique character development (cameo crab) and unique Trove Lobster abilities. The monsters slowly get harder (with a good amount of time to get used to the game beforehand), requires team work, but not an overwhelming amount (if you don't have a fullhouse of pros its still win-able).
Like everything in life, it can be improved. It could use more crab classes or sub-classes and perhaps a choice to make the game last longer xD. Also, more difficulty levels
and perhaps an end boss? Maybe a random end boss
Again, awsome job.