Hii, I've made a video about the game and wanted to share some feedback about it, hopefuly it is useful to you ^^
-The concept of the world is interesting and the world you've think of is quite well thought and correlated with the visuals and general level design.-The gameplay mechanics are simple but functional, BUT I'll say that modifying a little bit that recoil from the gun you might find an interesting gameplay mechanic that could be used for level design purposes.
-The visuals of the game are quite good, but if you plan on adding different enviroments you might want to keep colours palette limited as you've done here, but with different combinations.
Hopefully this is useful to you :D, also if you could subscribe that would help me a lot :)
Regards