For anyone who may be interested: I am currently working on a service that aims to make productivity tools work better together. The first apps I want to tackle are Obsidian and Todoist.
It is not about an alternative for this (very good) plugin, but maybe a companion. From what I have seen so far, this plugin mainly tries to build a Todoist frontend within Obsidian, so you do not have to switch apps.
I would like to combine Obsidian and Todoist in some other cool ways. For an early example maybe check this tweet.
Now, I am looking for people who are users of both apps, to talk about possible features and to test early versions.
If this is you, let me know 
Cheers,
Dominik