Birth in the shower is totally ok! Usually though the placenta can take a bit to arrive (if you are planning a physiological third stage with delayed cord clamping) so good idea to eventually waddle over with baby to the warm bed and wait there for it to arrive

One thing that people do that want to try to recreate the waterbirth or experience it if they couldnt (or even if they did and wanted to do it all over again!!) is, when you come home with baby, to do it then. a nice warm deep bath (if it were me i'd look into getting or hiring a birth pool), pop on the candles, darken the room and add some lovely essential oils and, as a family, have a nice bonding time in the warmth. there are a few BB members that have done this!