It’s a curiosity, a tech demo. Fun to show your friends for five minutes. Not a viable way to play Minecraft seriously.
The PSP version of Minecraft offers many of the same features as its PC and console counterparts, including: Minecraft Psp 5-3-1 Download Mediafire
Extract the downloaded file using software like WinRAR or 7-Zip. You will find a folder named MinecraftPSP or similar, which contains an EBOOT.PBP file. It’s a curiosity, a tech demo
The hardware cannot handle rendering alternate dimensions. It’s a curiosity