This game uses it's own rotation system, wich seems to be a bastard mix of Atari rotation and SRS, with different initial piece orientations. all pieces other than T and square start vertical (!). Ls and Js start upside down.
It uses a total lock time system, where you are given a certain number of frames of lock delay for each tetromino.
All pieces rotate as in SRS, EXCEPT for the I, which is left handed sega rotation system.
There are some wallkicks as well, but they don't seem to match SRS.
Apparently the ghost piece system was liscensed from Arika.