This is 100% my jam! If you're enjoying Orson Scott Card, here's some other authors I'd recommend who hit a similar balance of mindbendy concepts, speculative science and fun styles/stories:

• Dan Simmons' Hyperion Cantos stuff
• Vernor Vinge's Zones of Thought stuff
• Anne Leche
• certain Neal Stephenson stuff (Diamond Age, Seveneves)
• certain China Mieville stuff (Perdido Street Station, The City & The City, Embassytown)
• Robert Charles Wilson