For context, I have 1st Edition Warhammer Quest (1995 board game). I have NOT played Hero Quest (1st or 2nd Ed), Advanced Hero Quest (0th Ed Warhammer Quest), 2nd edition variants of Warhammer Quest (2016, 2017, 2018), or the first PC adaptation.
This is not a strict adaptation of the 1E board game, but it does, generally, give the feel of playing it.
Leveling up requires both gold &XP, unlike the board game (gold IS XP). Cheap level training and separating of gold &XP makes for an improvement over the board game.
Treasure is a bit stingy (3 cards for a full dungeon after clearing it [PC] vs 1 card per room/random encounter given immediately [board game]), but this is made up for by not requiring as much gold to level u (at least at 1->2; 20 GP vs. 1,000 GP).
As of this writing, I've played through the 3rd campaign mission (boss battle) which some reviewers have complained about, and the difficulty is exactly what I would expect. If the battle is too difficult, as with any such game, run side-quests first and use terrain to your advantage. (Side quests become available right before this 3rd mission.)
Difficulty is spot on. To put this in perspective, I'd tell new players of the board game that if they survived the first dungeon, their chances of surviving the second dungeon doubled.
Graphics are eminently suitable to the game. I can crank them to maximum at 1080P on a 2012 notebook with an NVIDIA 560M dGPU.
I find two things missing: better camera controls (I'd like to be able to lower the camera further), and better access to healing (starting with virtually any caster in the board game guarantees at least some form of readily available healing). I definitely don't like having to give up limited inventory slots in order to have access to healing.
All in all, I'd say that if you enjoyed any flavor of the related board games, I'd give this a shot when its on sale. I'd prefer a strict adaptation of the board game, but this'll do until that happens