If you are comparing gameplay to the Warhammer 40K tabletop miniature game, then there is little resemblance other than the fluff.
However, HH is a great way to get to play with some awesome and legendary units due to the scale of the conflict, which would be very expensive or even impossible to have with the tabletop minis game.
Another cheap option to experience the world of 40K would be Space Hulk: Death Angel - The Card Game, imo a very good simulation of space marines desperately fighting against hordes of tyranids. It is a fully coop game unlike HH.
However, HH is a great way to get to play with some awesome and legendary units due to the scale of the conflict, which would be very expensive or even impossible to have with the tabletop minis game.
Another cheap option to experience the world of 40K would be Space Hulk: Death Angel - The Card Game, imo a very good simulation of space marines desperately fighting against hordes of tyranids. It is a fully coop game unlike HH.