Looking at the Wikipedia Devanagari page you linked here, I was struck by several things off the top of my head (meaning, first impressions):
1. You have greater diversity in stops/occlusives compared to us.
2. We have greater diversity in fricatives compared to you.
3. You tie the letterform to the phonetics just as Tolkien did for his invented Tengwar script.
4. Like PIE, there's a dedicated series for "little superscript effects", you for the superscript-H aspiration, PIE for the superscript-W labialization (gw, kw, khw, etc).