UE4なら余裕
UE5はグラフィック系の追加機能OFFりまくればいける、雰囲気ゲーはグラ大事だからきついかも
というか、最終的に買ってくれるプレイヤーの環境で動くかがすべてじゃね

Unreal Engine 5 minimum requirements on Windows

Operating system: Windows 10 64-bit
Processor: Quad-core Intel or AMD 2.5 GHz or superior
Memory: 8GB RAM
Graphics Card: Any DirectX 11 or 12 compatible card

Unreal Engine 5 recommended requirements according to Epic Games

Operating system: Windows 10 64-bit (Version 20H2)
Processor: Six-Core Xeon E5-2643 @ 3.4GHz
Memory: 64 GB RAM
Internal storage: 256 GB SSD
External Storage: 2TB SSD
Graphics Card: NVIDIA GeForce RTX 2080 SUPER
External tools: Xoreax Incredibuild (Dev Tools Package)