The following short review was posted on gog.com in 2020
The game play is fast. You're nimble and have a great variety of weapons at hand. The weapons never feel redundant, and are really creative, even if they are similar in function when compared to the original Doom games. I was constantly switching back and forth with every weapon to dispatch the attacking hordes.
Collecting enough enemy's souls allows one to access a secondary function of each weapon that enables you to kill more monsters in some really creative ways. e.g. pulling stars from the cosmos, shrinking them and launching them at enemies, or with the AMID EVIL "BFG" weapon, you summon a black hole which then can suck monsters into it.
The artistic style of the game is fantastic. Classic looking, but yet modern, it has a vibrancy and art style like no other game I've come across. Meshes fantasy with astronomical motifs wonderfully and has interesting lore (make sure you read the codex!) Most of the maps are well done, play-ability wise, with secrets spread out to increase the replay-ability.
The monsters and bosses are also well done, a huge variety each having a different style according to the world you're playing in. For example, the world which has cosmic mages, experimenting with the Universe, there is a flying enemy called the "Order of the Eclipse" which summons Solar Eclipse fireballs and launches it at you. The charge time is actually the transit time of the moon, until it reaches the total eclipse stage at full charge, then attacks.
Lastly, I mention the sounds. The tracks are excellent, and all the sound effects are nicely done. From the level tracks to the "Welcome back champion!" after finishing each episode, its all such a joy to listen to. All these things any many more make AMID EVIL an all round new beast of the old, and I haven't had this much fun with a game in a long time.