These are some great suggestions! I tweaked the difficulty by reducing the damage taken and the amount of health you recover to make it a little easier for the jam, as I did not have a lot of time for play testing.
I was also thinking of some wall climbing mechanic to allow the player to traverse between street level and roof level, I'd love to test it out in the future. Then, replacing the fly with a glide is a good idea!
Grabbing a body would be awesome, maybe as an alternative attack which makes the player vulnerable but is great for stealth kills and regaining health on lone enemies.
Thank you for the feedback, I really appreciate it!