If the repack includes display options, try turning on "Scanlines" or "CRT Filters." It makes the pixel art look exactly as it did on a high-end arcade monitor.
: If the game fails to launch, you may need to install the DirectX Web Installer or specific Visual C++ Redistributable Packages (2013 version).
Some repacks also include Metal Slug 7 (originally for the DS) and the spin-off Metal Slug Advance . The "PC" version usually means this is a pre-configured emulation package or a cracked standalone port that runs natively on Windows 10/11 without needing a console emulator like MAME (Multiple Arcade Machine Emulator).