How is Minecraft Dungeons?

Been waiting for it to go on sale and figured my son might like it since he plays Minecraft a lot. Wondering if I gotta watch out for in-game purchases though (can I require password for purchases?) and online interactions (def don't want him chatting with others). It is seems pretty hack and slash but if a lot of reading is involved maybe he's too young for it (6 ½).

Edit: Sorry, meant to say Dungeons, not Legends.