I'm working on a new memory-safe systems programming language that is supposted to be (almost) as fast as C, Rust etc, but as simple and concise as Python: https://github.com/thomasmueller/bau-lang
There is a playground which is using a C compiler and WASM, and so is quite fast, while running fully in the browser. Theres also a (online) conversion tool to convert and compare source code. There are some benchmarks as well.
Writing my own (concise, simple) programming language was a dream for me since I'm 20 or so. Feedback would be great!