It's the original Doom, with an additional weapon, new enemies, and bigger maps! Unfortunately, it feels less like the superlative original trilogy and more like the Thy Flesh Consumed expansion in all its cheap janky glory. The levels have some interesting gimmicks to them, but they're often needlessly sprawling and obtuse, and don't compare favorably to the atmospheric homerun of the original thanks to their largely scattergun approach to design.

Part of this game's level design issues can be attributed to its level structure compared to the original, which had multiple episodes, each 8 levels long. 8 levels was a good length for each episode as you gradually increased the size of your arsenal and faced off against a big boss at the end, and then you would start off the next episode afresh - the beginning of episode 3 which pitted the player against a Cacodemon with nothing but a pistol made a strong impression on me. Doom 2, on the other hand, is made up of one unbroken episode 30 levels long, which leads to two issues. Firstly, you normally attain all the available weapons and ammo upgrades like five levels in, depriving you of the feeling of 'powering up' for the rest of the game. But more crucially, the lack of cadence and pacing created by this single overly-long episode leads to a general lack of direction, and there are so many filler levels that make it apparent that the developers seemed to be running low on ideas.

In the end, this is still Doom. It's still lots of fun, it's still competently designed, it still excels in capturing the feeling of flying by the seat of your pants and always being a mistake away from death - a feeling enhanced by the greater variety of threats and size of enemy formations, although as mentioned above it can sometimes get a bit cheap. But it's also an unfortunate reminder that bigger isn't always better.