Hi, cool game.
I like how the dungeons rooms are connected, and the controls are smooth and visuals clear. The guns also feel nice.
Some quick improvements:
Keyboard Q/E to switch weapon. Wheel is prone to switching more than once accidentally.
When picking up a new weapon, print the name of the new weapon. This makes it clear if you're picking up a duplicate, or something you've seen before.
Text popup when collecting items (heal, key, etc.)