First up, let me say this: I completed Time Gal in Easy mode. I’m not proud, but any other mode is completely impossible. You simply have no way of reacting correctly to the action, and it’s unplayable in the same way Dragon’s Lair is.
With that confession out of the way, I’d also have to say it wasn’t worth it. Like Dragon’s Lair (and other FMV games of this kind), it doesn’t work. You see, it’s two things: A reaction (and/or memory) tester game, and a film. As a game, remembering every button press, in order, for 30 minutes of gameplay is not fun in any way, shape or form. As a film, it’s not possible to enjoy it because you have to concentrate on the button presses. As a result, it’s best to experience via watching someone else – who has memorised the entire sequence so they don’t fail too often – play it instead.
Time Gal is a stupid relic of an age where video was impressive and what seemed to be an interactive cartoon wowed everyone, but it’s boring, shallow and annoying. And the MegaCD version has terrible grainy FMV anyway. What a waste of everyone’s time.