Support for quick save and load were added.

Support for aspect ratio correction was added.

Medikits, stimpacks, and berserk packs were changed to use a green cross instead of a pill.

The Android and PC versions support addition of custom add-ons by the end user. The initial batch of supported add-ons were SIGIL, No Rest for the Living, TNT: Evilution, and The Plutonia Experiment.

Renderer framerate increased to 60 Hz (It was later updated for 120Hz and above with options to cap it at 30, 60 and 120 frames a second), with an interpolation system written by Alex Mayfield (AlexMax).

Significant changes and additions were made in the update released on January 9, 2020:

The automap shows the kill, items, secrets statistics during the game, using little icons of a skull for kills, a health bonus for items, and a green interrogation mark for secrets.

Music tracks does not loop seamlessly due to the nature of them being a recording.

Doom and Doom II each have their own sequences, and after the montage ends, the staff credits roll will begin.

New to the port is the addition of creative credits that resemble the ending credit sequence of Doom (2016), where various levels and battles are shown briefly while the camera pans around and showing the names of Nerve Software key staff.

As of the September 2020 update, the TITLEPIC and CREDIT lumps screens are shown again, modified for 16:9.

Originally, the DMENUPIC that was the title screen in the original Xbox 360 version is used here.

This was later changed in the Januupdate (see below). Initially the pill graphics from previous Doom Classic versions were reused.

The pickup sprites for the stimpack, medikit, and berserk (STIMA0, MEDIA0, PSTRA0) are modified in compliance with the Red Cross' wish that its symbol not be used in games.

Cheat codes are available and accessible via the Options menu.

Note that many changes below are carried over from previous Doom Classic revisions. This also means that certain new features such as freelook are not planned, and that certain limitations of the original engine, such as the issues when attempting to load sprites, flats, and textures from different archives, are left in place. Static limits are raised and engine bugs are fixed on a case-by-case basis, as required to support the additional features introduced in the port without breaking demo compatibility. The actual Doom game code is contained in a DLL which is loaded by the Unity framework to run the game this allows simplified portability. Unity is merely used as a shell-more formally referred to as an abstraction layer-for handling input and output, while rendering is still performed by the original Doom engine. Although utilizing the Unity engine, this is a true Doom engine port, not a Unity recreation.

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