Judging from the screenshots P2 seems very similar to P1, havent tried yet, will see how UI and gameplay is.
I took a quick look at the files though. The .PIC file sizes makes me think they are uncompressed bitplane data. COVER1.PIC for example 40(320 bits) width x 200 height x 4 bitplanes = 32000 bytes. Dont know if ST uses bitplanes like Amiga however