The problem with the Linux Repo is what I said, people do not look there for Games, because what is there frankly is not worth it, but if there is TDM in the Repo, people surely pay more attention, since TDM is a Exception between OpenSource games and it will bring fresh wind to the other games that are in the repositories and maybe it will also cause others to dare to create OpenSource games, because what is offered so far is the same as it was 15-20 years ago . As commercial games are increasingly being developed for Linux, TDM aside, the OpenSource communities are resting on their laurels in this field.
For this, it is not necessary to make major changes in the way of distribution, it is enough to get the installer there.
In general, I do not think that hosting TDM in a store or repository is the only way to increase users, starting with word of mouth there are many other options. People who like an excellent video game there are plenty.