Hi, I removed the other post in the SuperLemmini thread as it was basically the exact same post, and it's better to have replies kept in one place like here.
With most people here still primarily playing and creating on NeoLemmix and Lix, and both are still actively maintained and updated, it seems pretty tricky to me to get anyone here to jump over to a new game and editor you'll be making. You'll likely have to offer a bunch of new things that aren't available in the other games and also compelling enough to get people to start creating new levels specifically for your game and for yet others to try them.
At the start I suspect there'll be many here who takes a wait-and-see approach, and will be sticking with NeoLemmix or Lix that they are already familiar with. This will create a dilemma for level designers. Should they create levels for your game and risk having fewer people trying them out, or stick with the games that they know already have an audience? They could potentially at least port their levels over to your game's format (assuming it's easy and quick for them to do so), but then they won't be using anything unique to your game in those ported levels, and thus wouldn't be highlighting anything new that would help differentiate your game from the other ones.
I think best case scenario, the world is large and there are perhaps plenty other people out there who will be interested in trying your game and editor, and yet have no awareness of this forum, NeoLemmix, nor Lix. If you can reach those people, that will give your new game the best chances of an eager audience that aren't biased towards the existing games like NeoLemmix and Lix.
All that being said, don't get too discouraged and feel free to prove me wrong!
We do see people here trying out contemporary, commercially-released lemmings and lemmings-like games from time to time, so I'm sure even here you will get at least a few people to try out what you've produced. Especially if it also comes with new levels that have compelling visuals and puzzles.