If it can utilize its early access period well and continue the obvious passion the development team has, it could become a very big game among the roguelite community over time.
Devil Jam is a solid player in survivors-like games, and I think most players who enjoy them will want to give it a play. I even see a chance at this game drawing in from the music crowd, especially because of the rhythm-like mechanics. It is a fun, rewarding play loop that has the air of addictiveness to it. It’s a great game to spend time on, and the increasing difficulty scale keeps it somewhat different as you progress.
For the most part, this game will be best enjoyed by a very particular type of audience, especially those interested in philosophical musings. I’m not sure if the majority of players will fit into that audience, but I do believe that there is enjoyment to be had on some levels by a large chunk of players.