Temples in Kerala have a distinct architectural type (trying to keep a similar essence of Vastu), In particular as a result of climatic discrepancies Kerala have with other aspects of India with larger rainfall. The temple roof is usually tiled and is sloped and the walls will often be square, https://hanuman-mandir-adelaide.mystrikingly.com/blog/the-significance-of-hindu-temples-in-preserving-culture-and-spirituality