Crappy Soft have published their third entry for MSXdev'05: Manicomio, a text based adventure in which you have to escape from an asylum in which you have been secluded after a mysterious crime. At the moment, the game is only available in Spanish.
With still a couple of days to go to the deadline, some more MSX1 game releases are to be expected during the coming days.
Relevant link: MSXdev'05 status page