That's tough. I'm taking guesses here, but I can do that at least:
1)
- the gun shooting animation is a bit wobbly (maybe a simple 2-frame-back-and-forth would be better)
- the overall recoil could be much lower (maybe it's just personal perference, but I like an automatic rifle to be more precise)
- mouse sensitive adjustment would help some here as well to achieve higher rprecision feeling
2)
- Very tough to answer. It just does not feel vey impactful to take damage from enemies as a player. It's rather that, without the HUD on the left bottom, I would basically have no idea I've been hit hard. Maybe in "impact" sound plus some low-on-damage-hud... you'll find something! :)
Hope this helps somewhat!