Typically, big + goon is not a good combo to go up against. It still isn't in this matchup, as can be demonstrated by the ending of the South Park episode Stanley's Cup. The name of the game is to minimize contact at all, since if they get railroaded, they're essentially done for on the ice and for future games. They basically have to get extremely lucky in order to actually get out of their zone, much less get to the net. If alien technology is not off the table, teleportation technology could be use (shrink rays would just make the opponents denser and therefore hit harder). Or, if they are willing to play dirty, they'll have to pull a classic maneuver perfected by Ed Belfour: yes, the classic stick to the lower almonds (if such a thing would be possible, at least). Lots of options, but it doesn't look good for you or your alien friends, no matter what you do because of their sheer size.