Manhattan Project is the early working title of Blood Lines, an action / puzzle game developed by Radical Entertainment in 1998, for the original Playstation. In the game the player needs to touch the light sources that are placed in the levels, to change them in his own color. At the end of the time, the player that owns more lights wins the match.
From these early screens we can notice that the characters in the beta version were different and even the light effects are not like the final ones.
Thanks to Celine for the contribution!
Video (from the final version):