I don't read thriller/horror often but the one that stuck through me the most was bastard and pigpen. the story line is sosoo good and it def checks off the boxes of suspense and major plot twists
https://www.mangago.zone/read-manga/look_alike_daughter/
https://www.mangago.zone/read-manga/you_are_still_in_a_bird_cage/
https://www.mangago.zone/read-manga/yuukoku_no_moriarty/
https://www.mangago.zone/read-manga/shin_ai_naru_boku_e_satsui_wo_komete/
https://www.mangago.zone/read-manga/tomodachi_game/
Also this one!! It's rlly good https://www.mangago.zone/read-manga/tsumi_to_batsu_no_spica/
any suspense there? like the type with jump scares and major plot twists