Because V1.0 in Zzap64! Magazine was so buggy and unstable. I did latest feature additions in memory constraints beyond belief. Game uses entire 64kB memory. I'll push out more bugfixed version soonish. You are very welcome to come giving feedback and reporting bugs in my development stream at https://twitch.tv/proton_fig
Thanks for the feedback. Krill's loader just works. and the resident part of it fits in one memory page. It also supports unloading, so high score saving works. Realtime raycasting of the torch light uses more than 25 kilos of memory. Then all graphics eats memory twice because of the double buffering. Musics use 5 kilos etc. And what comes to the loader, I have also my own loaders. Source code is for the IRQ-loader only. I wrote one of the world first IRQ loaders around 1987-1988. But Krill has done everything ready and packed it nicely.