Hi!
Onlyplay designs mobile-first. Mobile-compatible means game works on mobile but was designed for desktop first - often has small buttons, cluttered UI, heavy graphics. Mobile-first means game was designed primarily for mobile: large touch-friendly buttons, simplified UI that works on small screens, optimized graphics that load fast on cellular data, performance tuned for lower-end devices, vertical or adaptable layouts. Most players globally use mobile, especially in emerging markets. Mobile-first isn't compromise - it's recognizing where players actually are.