I started playing METAMORPHOSIS ALPHA back in the 1970's and the 1st edition is still my favorite.
HOUSE ON THE HILL is written with 1E MA in mind. It has a very old-school look to it with B&W interior line art and blue maps, much like the AD&D modules of the era. I wish that HOUSE ON THE HILL had been done in the 70's because maybe the METAMORPHOSIS ALPHA rpg would have become more mainstream back then.
As to the adventure itself, it's well written and fun to play. The house itself has 17 different encounter areas well detailed. There is a section near the end of the module (written by James Ward, the original designer of METAMORPHOSIS ALPHA) that gives some ideas for variant houses. There is a 10-page section of rules and tables for random house creation, along with a template for you to design some of your own.
Anyone who plays METAMORPHOSIS ALPHA of any edition will find that this is an awesome resource, and I think it's a fun adventure to play.