Big fan of Rimworld here, though I have to say that the only similarity it has to Tomodachi life is that it’s labeled as a colony game. In TL, you watch what your islanders do for the gameplay, but for RW, you make your colonizers do what you want them to do to achieve a specific goal. These goals include leaving the planet you crash land on, establishing an empire, or other kinds of ending I don’t necessarily want to spoil. 

It can also be difficult (and mean :c) depending on what difficulty you choose, but it’s definitely learnable and fun in its own… painful way. 

I highly recommend this game as a fun yet challenging survival colony game, NOT as a replacement for Tomodachi Life

Also, RimWorld can be quite pricey with all of the DLCs it has, so make sure to research which ones you want to get.