You can also download the MD/Genesis port and use a genesis emulator. It takes up way less space. It is a work in progress tho. https://github.com/andwn/cave-story-md/releases
I first played it on my Lakka PC in Feburay of 2018 and I got stuck on Monster X. 6 months later I bought CS+ for Switch and me and my friend beat it on easy co-op from 4:30pm-2:30am. I don't know if it was the sleep deprivation but I cried for 20 minutes when Curly died. Edit: we listened to...
So, I am really stupid. I have gone to every forum and I can't get any help. I understand some stuff but then they say cmake and I just get lost. I am running rpi 3 with raspbian.