No puedo hablar muy bien español. Por lo tanto, esto es lo que tengo que decir en Inglés. Si alguien sería tan amable como para traducir, que sería grande.
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I remember the game being on Sega Channel. It's exactly the same as it's Japanese release, no translations were given. This is probably due to Sega Channel being out in Japan as well. Someone has made an unofficial translation of the game. You can download the patch here:
http://mijet.eludevisibility.org/Pulseman/Pulseman.html
I know someone who has a Spark (Pulseman's prototype name, it was changed very late in development) prototype that's two or three months before release. Unfortunately he cannot go into detail what's different (he hasn't played the game that much), but he said that the girl on the top right corner says "Be careful, Spark!" before a boss battle still. Pretty neat.