I like the graphics and the concept, it's got good potential. There's a few issues which I think need looking into though, as it feels a bit frustrating at times at the moment.

• The initial sensitivity value seems to default to 0; it took me a little bit to figure out how to change this, but this seems a bit unusual as a default setting anyway, I would expect it to default to around 50% initially
• The monsters at the moment keep pushing into the player; they should really have some kind of stopping distance once they get close enough, because at the moment when they push the player it messes up the camera movement, and can also make it difficult to see what you're looking at
• The spawning of the monsters can seem unfair, as often they will spawn behind the player; this might be a bit trickier to resolve, though some options to think about are maybe preventing them from spawning outside of the camera view, or having some of audio or visual indicator as to when they spawn behind the player
• The general field of view seems a bit low; I don't know if there was a setting to change this, bit it felt incredibly zoomed in, which was making it difficult for me to discern where I was in the level

There are maybe smaller improvements around the gameplay loop and enemy variants, but I think improving on the points above would radically improve the core gameplay and set you up well for further content improvements down the line.