while it does a good job replicating episode 1 aesthetically, the levels are riddled with questionable design choices. doors that dont need to be there, a million secrets often crammed onto the back end of a level resulting in useless items unless youre not pistol starting, and just a bit too easy. for an author who claims his work is top notch and the best of the best, you shot your arrow pretty far from the bullseye my friend.
Another one I haven't played for years and years and just revisited: Fava Beans is a solid E1 replacement and a good one if you want a chilled out, mostly really easy WAD. The level design is a cut above considering the historical context of this set, and it nails the E1 feel. Heavier monsters are introduced much earlier, but the difficulty rarely gets above casual.
E1M8 is anticlimactic and feels like a letdown after the consistency of the preceding maps, but aside from that I recommend it for an easygoing old school Doom fix. That said, it could have been harder in places. There have been better E1 replacements since, but Fava Beans is still worth a look.
Best: E1M4, E1M5, E1M7