Yesterday I flashed the rom. It seems very nice already, thanks a lot to the dev!
I just encountered an issue while trying to flash it, and I saw in the comments that there were a lot of people with a similar problem. So I want just to post my problem and the solution I found as it can probably be useful for others not so experienced users like me.
After I followed the procedure step by step for doing a clean flash, I was stuck in a loop where the phone was always booting into TWRP (and yes I had formatted the data after flashing the rom). I tried with TWRP 3.6.1 and 3.6.2 (last versions) and I tried the PE+ the version of may and of june.
Finally, I solved it by flashing the PE's recovery and just doing a format data with this recovery. Apparently, the format data of the TWRP does not work, or I am too noob to do it correctly, not sure.
In any case, I am not sure why I had this issue but if you have it too, either instal the rom with TWRP and then flash (in fastboot mode) the PE's recovery and do a format data, or just use the PE's recovery from the beginning in order to sideload the rom and format the data.