The Watara Supervision hit the market in 1992 and went down in history as a largely unsuccessful competitor to the Gameboy. Mobygames also lists only 66 games for the device, including Assembloids as the first homebrew production.
Assembloids for Watara Supervision

Assembloids is a fast paced action puzzler in which the player composes heads of different characters.
In the middle of the screen, a quarter of a face happens to appear that the player can move into four areas. For every complete face you get points – the more uniform the shape, the more.
But the clock is ticking and every mistake costs a life.
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