Excellent adventure for begginers player and master, too! I mastered it for a group of 5 players and had a great time

Aside from a magic item that you really wouldn't give out at first level (which is not overpowered, just unusual), this is a well thought out dungeon crawl.

The villains have motivation so this is a great module to learn how to play the game in a combat oriented way.

I would note that there are few chances for roleplaying or exploration. A puzzle guarding a side room, with a talkative monster locked behind it (maybe it explored the dungeon, and the cultists locked it in here for now) that will reward the players if they can extract it safely... something like that.