Here are couple of my tips:

• Metal Slug (all of them) - ARCADE (NeoGeo)
• Commander Keen 4 (and mods like Aurora Bliss) - MS-DOS
• Pokemon (e.g. Modern Emerald) - GBA
• Doom - MS-DOS (but I'd recommend play e.g. Brutal Doom)
• Duke Nukem 3D - MS-DOS
• Prince of Persia - MS-DOS
• Burnout Legends - PSP
• Limbo - Android (or Steam)
• Lotus 3 - MS-DOS
• Retry! - Android (have to find APK)
• Super Mario Land 2 DX (DX is the color mod) - GBC
• See my favorite pico-8 games