This is the fanmade Master System port of Sonic the Hedgehog Triple Trouble running in 50Hz, in other words, PAL, yeah the music isn't optimized and is therefore slower and Sonic (and Tails) feel more floaty, yatayatayata...
I did this with RetroArch by setting the System Region to Europe, which in turn, automatically switches it to PAL...
but really who would want to play like this?