If on mobile (which is not recommended due to WebGL performance and support on mobile), make sure you click fullscreen in the bottom right corner.
This is a project I created to show off some of my experiences and introduce myself in a more interactive (and hopefully fun) way! This game was made with Unity and C# and targets WebGL so as mentioned earlier, while it may technically work on mobile (depending on your exact device and browser), it does not run very well on mobile platforms. Nevertheless, if you insist on trying it on mobile, I have included touch controls for those platforms.