Also, Nim seems to be targeting a different niche from Python. As Nim is statically-typed and AOT-compiled, its closest competitor is probably Go. The difference is that Go deliberately tries to be a simple language, while Nim is much more complex.
However for me Nim appeared simpler when starting out. Not much get in your way when prototyping and scripting. Other languages require some mental overhead. I'm referring to Go's error handling, Java's mandatory exception handling, Rust's tracking lifetimes, etc. Thus it's much more pleasant to use than the rest.
And to be perfectly transparent, I know relatively little of Go. My impression is that nim has more features in general, which could be considered to make it more complex. That can be a good and/or bad thing depending on perspective.