Maybe I found two issues:
SEGA Alien Storm doesn't work... in theory the bootleg version (astormbl.zip) should work fine, instead the screen remains black, if you press L+START (insert coins) a green writing appears (PRESS START), but nothing more.
SEGA Altered Beast (altbeast.zip and altbeast2.zip) isn't playable, the game begins without problems, but the background doesn't scroll and the sprites of defeated zombies remain on the screen.