An interesting spin on the original Doom formula. This game is more unforgiving and in some levels even unfair. It is a lengthy game with weird design choices. The design (for some people) can be frustrating, at some points in the game you can be teleported to a tiny room filled with demons that decrease your hardly found health. Despite this, the game is fun, and the game loop just shouts early FPS level design.
For me, the levels are more fun to explore than the ones in the original Doom. Backtracking is not tedious and in fact, it's challenging, since many enemies may emerge from hidden rooms that are in previously cleared areas. Most levels are well distributed between fierce action and quick exploration. Sometimes you may see very obvious secrets, other times you will be punching or shooting the walls in every level.
Sound design and music are not my cup of tea. However, I understand the hardware it was developed on, and also the influence of metal and 90's rock music. The variety of demons makes this game more dynamic. You are forced to play the game differently compared to the original game.
In the end, this game improves on the formula of the original Doom. This game is proof that a simple game loop is sometimes better than a game with complex mechanics.