Need some opinion about website design!

Hello guys. I'm a UI/UX designer with a small experience. I worked on small projects before. Made simple websites using HTML, CSS, and some Javascript. Just recently I've been asked to create this website https://RealSpyApps.com. This is my best project thus far, could you give me any pointers on how I could improve? I'm still a junior designer and looking for all possible feedback. I've spent a lot of time on this client :]

View attachment 266663

Need some opinion about website design!