The game feels really sluggish and enemy variety isn't very aplenty. I also am not much of a fan of the movement controls being shifted to be esdf rather than wasd.
Here are some changes that really need to be addressed:
Change movement controls to WASD, add arrow key support
Add a reticule
Basic optional tutorial (can be a simple menu that tells the player what enemy does what)
Player needs to be faster
Gun needs to be more visible
Enemy spawns need to be disallowed near a player
Melee needs to have knockback
Disable music and sfx (made writing this review annoying hearing the loop
Enemy variety!
Easier to read health bar
kill and time stats visible in-game
changes that would be nice but not needed necessarily:
melee can send away projectiles
gamepad support
Make music loop better