Thanks for your constructive feedback! Glad that the idea of the game is not lost.
I checked and realized I've always remembered the code wrong. Okay, that's embarassing. I did intend it to be the famous code.
About the mouse control, now I see the default mouse sensitivity is likely too high for others, since I use a pretty low mouse dpi. Considering how people generally have a higher mouse dpi, especially those who work with 4k minitors, I can only imagine how hard it will be to pin point an object. Very good point.
It occurs to me that, even with only one single play tester other than myself, these problems would probably never made their way into release. That's a lesson learnt. Anyway, I'll get these patched as soon as I have time!