"Doom clone" meaning in English

{
  "etymology_text": "So called from the similarities with Doom (1993), an early popular game in this style.",
  "forms": [
    {
      "form": "Doom clones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Doom clone (plural Doom clones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Video game genres",
          "orig": "en:Video game genres",
          "parents": [
            "Genres",
            "Video games",
            "Entertainment",
            "Games",
            "Mass media",
            "Software",
            "Culture",
            "Recreation",
            "Media",
            "Computing",
            "Society",
            "Human activity",
            "Communication",
            "Technology",
            "All topics",
            "Human behaviour",
            "Fundamental",
            "Human"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A first-person shooter."
      ],
      "id": "en-Doom_clone-en-noun-NKrL~DFE",
      "links": [
        [
          "video game",
          "video game"
        ],
        [
          "first-person shooter",
          "first-person shooter#Noun"
        ]
      ],
      "raw_glosses": [
        "(video games, dated) A first-person shooter."
      ],
      "tags": [
        "dated"
      ],
      "topics": [
        "video-games"
      ]
    }
  ],
  "word": "Doom clone"
}

{
  "etymology_text": "So called from the similarities with Doom (1993), an early popular game in this style.",
  "forms": [
    {
      "form": "Doom clones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Doom clone (plural Doom clones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English dated terms",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Video game genres"
      ],
      "glosses": [
        "A first-person shooter."
      ],
      "links": [
        [
          "video game",
          "video game"
        ],
        [
          "first-person shooter",
          "first-person shooter#Noun"
        ]
      ],
      "raw_glosses": [
        "(video games, dated) A first-person shooter."
      ],
      "tags": [
        "dated"
      ],
      "topics": [
        "video-games"
      ]
    }
  ],
  "word": "Doom clone"
}