From a small desktop tool to a visual backtesting web app

I originally built this as a small desktop tool to speed up my own backtesting.

I was testing a lot of ideas and didn’t want to constantly change code for every small variation. I just wanted something faster and more flexible.

Over time, I kept adding things I personally needed, and it eventually evolved into a visual web app.

I recently put it online and I’m mainly looking for honest feedback — especially around the overall approach and UX.