Considering it sounds like a very basic idea, I don't think you need to abandon your current project just to work on a new idea.
I often jump back and forth between two or more projects, just because each project may be stuck at different phases. If I am getting frustrated with art for project A, I'll switch over to project B which is stuck at the programming phase. If I completed some major programming but don't want to start on a new section of code, I'll switch from B to writing project C's story. If I'm inspired by my writing, I'll switch back to art for project A again. this way I don't get overloaded beating my head against a wall.
It sounds like you are just starting the idea, nothing pinned down yet, so feel free to take take a break from your current project just to experiment. for me, art is the limitation and deciding factor, nothing wrong with exploring the possibility of how you may make the game. once you get some ideas and assets together, I find it often helps to do a write up, the write up acts both as a note, and as a good stopping point so you can switch back to your first project.