Awful title screen design. Buttons mess with background. Background tells nothing about game - no intrigue, no characters, no fun. But you inserted not needed animation with slow down comp.
Main screen GUI is awful also.
I want to see all available weapons. This way I will know that I can change them. I need to read help to know this. Why you hide them?
Gun cursor is awful. I even can’t understand what it is. Maybe something like gun will be better? I can see gun but can't see the rifle scope. Did you play shooters? Play again please.
How can I see that something wrong happen when I touch enemies? They just walk on me and then I dead. Visual description needed. Maybe animation, maybe red screen, maybe blood I don’t know. But I need to see that someone eats me.
What this numbers in top left corner mean? Is it time, health, energy?
I can’t see Play again or something like that on Game over screen.
How can I win, what is goal?
How much shoots I need to kill enemy?
I don’t know how you did this game. Are you playing games before?
Play some game and then redesign this week mess to something interesting.
Good luck.