If you're looking for a similar (free) native app for Linux devices, I highly recommend checking out Planner[0]! Super clean and pretty UI, it reminds me of an older build of Things with all the best features fleshed out. It also integrates with Todoist, which I'm unfortunately tied to at the moment. Making matters worse, it functions perfectly, giving me no reason to replace them in my stack :(

[0] https://appcenter.elementary.io/com.github.alainm23.planner/