How to Play Rayman Lum’o’Grams on a Steam Deck:

• Proton 9.0-4
• Game Resolution set to 1280x800 (in Properties)
• Launch option set to -fullscreen (in Properties)
• Frame Limit to 60 FPS (in Performance)
• TDP Limit to 4 Watts (in Performance)
• Manual GPU Clock to 200MHz (in Performance)
• Mouse Only layout with mouse sensitivity down to 65% (in Controller Layout)

Thanks to NastyShrimp for this guide and custom Steam Deck artworks!