*****Hello, sir.***** Thank you for your job posting.
I had read your job description and am very interested in.
I am a Unity 3d/2d game developer who have many experiences, hence it might be a good fit for me. I have already implemented projects similar to yours.
Also you can see my some works in portfolio.
I am available now and will provide a good result.
I'd be very happy working with you and with such lovely game development which I'm interested in.
Hope hearing from you soon. Thanks for your reading my proposal.
Best regards.