I'm ignoring the bit about the platinum and recommending EDF 4.1: The Shadow Of New Despair. It's great fun in co-op and, no foolin', I met 2 married couples during my time with it. It does have a plat, but the average plat time is I-N-S-A-N-E. Probably over 500 hours. I got mine in Just over 500. But you can play through Easy/Normal/Hardest and still have a blast. Another one I loved is Dead Nation. Granted, I liked solo mode more, but the co-op is solid top down twin stick fun. Much shorter plat run. Although the co-op makes it more challenging tbh.
Chinese food for breakfast