This review isn't for the game, it's fantastic, but for the port itself.
The current underlying engine this is using, KEX, has a ton of issues, main few being that
* The mouse speed is tied to the framerate.
* Multiplayer netcode is just... eh.
* The WAD Browser is quite heavily scuffed.

Overall, buy this just for the IWADs or if you got a friend on console that you want to play with.
Otherwise, please look into and select one of these sourceports below. You'll also get my personal say on each.

* Woof: Very good for casual, yet engine accurate way of playing the older games. It also supports features from this port like the weapon carousel and the Remix OST without having to modify the extras.wad file.

* Nugget Doom: Literally Woof with some extra features, worth trying out if you like Woof.

* Crispy Doom: Good for casual play, but can only do Vanilla and Limit Removing maps. A ton of features from here are also present in Woof/Nugget Doom.

* DSDA-Doom: Very, very good way of playing the older games that are extremely accurate to current and older versions of id Tech 1, among it's forks like Boom and MBF. It also has a hardware renderer that looks extremely good. Current version (28.2 of the time of the review) has a sound bug on complevels 2, 3, and 4. Includes a good amount of speedrunning utilities if you are into that realm.

* Nyan Doom: DSDA-Doom but with some QoL & visual features. It also brings back the ENDOOM screen to the port. Look into this if you liked Woof, Nugget, or Crispy, but as well as DSDA-Doom.

* GZDoom: Okay way of playing the older games casually, just do not expect vanilla gameplay. Settings menu is kinda bad and the defaults are horrible. Tons of mod support due to its engine features, though.

* LZDoom: Basically GZDoom but it can run on older hardware and is lacking features. I suggest looking at the ports above (Minus GZDoom) for ports that'll run on old hardware, though.

This review isn't for the game, it's fantastic, but for the port itself. The current underlying engine this is using, KEX, has a ton of issues, main few being that * The mouse speed is tied to the framerate. * Multiplayer netcode is just... eh. * The WAD Browser is quite heavily scuffed. Overall, buy this just for the IWADs or if you got a friend on console that you want to play with. Otherwise, please look into and select one of these sourceports below. You'll also get my personal say on each. * Woof: Very good for casual, yet engine accurate way of playing the older games. It also supports features from this port like the weapon carousel and the Remix OST without having to modify the extras.wad file. * Nugget Doom: Literally Woof with some extra features, worth trying out if you like Woof. * Crispy Doom: Good for casual play, but can only do Vanilla and Limit Removing maps. A ton of features from here are also present in Woof/Nugget Doom. * DSDA-Doom: Very, very good way of playing the older games that are extremely accurate to current and older versions of id Tech 1, among it's forks like Boom and MBF. It also has a hardware renderer that looks extremely good. Current version (28.2 of the time of the review) has a sound bug on complevels 2, 3, and 4. Includes a good amount of speedrunning utilities if you are into that realm. * Nyan Doom: DSDA-Doom but with some QoL & visual features. It also brings back the ENDOOM screen to the port. Look into this if you liked Woof, Nugget, or Crispy, but as well as DSDA-Doom. * GZDoom: Okay way of playing the older games casually, just do not expect vanilla gameplay. Settings menu is kinda bad and the defaults are horrible. Tons of mod support due to its engine features, though. * LZDoom: Basically GZDoom but it can run on older hardware and is lacking features. I suggest looking at the ports above (Minus GZDoom) for ports that'll run on old hardware, though.