Enter the Gungeon is an action-adventure roguelike video game developed by Dodge Roll and published by Devolver Digital. The game follows the player character's search for a gun that can kill the past. The player must traverse procedurally-generated dungeons, fighting off enemies and collecting loot. The player's goal is to defeat the bosses at the end of each level and progress to the next one. The game features a variety of weapons, items, and characters that the player can use to their advantage as they progress. It also features multiple difficulty levels, allowing the player to customize their own experience. Enter the Gungeon is available on Windows, macOS, Linux, PlayStation 4, Xbox One, Nintendo Switch, and iOS.
It is not similar at all. Ittle Dew is a modern link to the past and literally has no similar elements to Enter the Gungeon. I have no idea who would compare them in terms of gameplay ...
Oceanhorn
The Binding of Isaac
Vertix Online
Hyper Light Drifter
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Hordes.io
The gameplay is identical. EoG was inspired by TBoI. Both roguelikes. Both feature tons of unlockables + secrets.