I'm going to keep this extra super quick because this is basically season 1 extended. There is a bit more story in this season and a few more adventures (extra points) but the ending is a bit contrived and could have been a bit more climactic (take away said extra points). There are a few new characters introduced but they mostly don't add anything to the plot, but they are fun so it doesn't matter much.
Basically, if you liked season 1 you will like season 2. Don't expect a strong ending and if you like it hope they go for season 3 in the future!