I'm curious to what do you mean by crunchy. I've seen the term used for several things in ttrpg space.
Do you mean that the game is procedures heavy? Or math heavy?
The term crunchy here mostly applies to the combat rules. When making attacks you follow a lot of steps, sometimes multiple times (tracking the damage and location of every single bullet for example). So I guess in this case it means "procedures heavy" more than "math heavy" because, even if calculations are done multiple times for a single attack, the math is very simple (mostly adding or subtracting low numbers).
Overall in the game I tried to keep complexity as low as possible (therefore I used the term "streamlined" to describe it), but I kept these rules in because I liked the "realism" and danger that they brought to combat.