Nicemetal is a tower defense game with an interesting gimmick, created by babarageo for distribution at Comiket 76. There are a number of unmanned defensive structures in each map, and you have to send out soldiers to operate them for a short amount of time before they'd return back to base.

Only one level is included in this online trial version of Nicemetal. You can start playing the map by selecting the second option shown at the main menu. (trailer)