Very good looking old school first person perspective game. There some nice different types of weapons and different types of enemies.
I think the movement would be better if the jumping has less air friction. The jump height variable may be a good idea for an fps game? I'm not used to it much.
There are noticeable imbalances of weapons pros and cons currently. But I'm sure you know well that these need to be fixed to make all play styles fair.
Nice work on making a game by the way.