The 'Terriers' took the lead in Yorkshire, but were unable to add to advantage lead before the 'Hammers' pegged them back late on.
"It was a good game, both sides wanted to win, both sides wanted to create offensive situations," Wagner said.
"I think in the first half, we were the team with more clear-cut chances, we deserved the lead for sure and it was a great goal from Pritchard.
"We had further opportunities with Mounie's one-on-one, we hit the inside of the post, hit the bar from Mounie, we had a penalty incident which I think was a clear pen when Zanka was fouled from the corner.
"Unfortunately, it was a game where we didn't have the luck to score more than one goal but the way the players dug in, defended and performed was good. Obviously it's frustrating when you don't win even if we have to say that West Ham in the second half had good chances.
"We don't have luck, it only means we will work harder. When it turns and we do have the luck we'll have more goals and more points."