That's kind of too bad. Because honestly, someone telling me I HAVE to do something or do it the way THEY want me to just encourages me to tell them to fuck off and do what I want anyway. And I suspect there are many more like me around, so finding work-arounds won't be very difficult.
Besides that, they've created a decent side-scolling beat'em'up, but there is a reason that type of game isn't made very much any more, if at all. Compared to other formats it simply isn't very engaging, or for that matter entertaining, you've got a handfull of attacks and only a 2d (technically 3d because of jump, but that's a really limited 3d) environment to move around in, there isn't all that much to do. TBH if this game didn't have any hentai I wouldn't be playing it, and imagine alot of others wouldn't either.
Now I'm not bashing zeta team, they've done quite a good job. The fact is that the format is outdated, and while fun to play for a bit it definately isn't worth me spending 8 hours + in a single sit-through to beat a game that I can't save during. And since there's only so much an amateur team can do using only their free time, I wouldn't ask them to try and make something in the format of modern beat'em'ups like god hand.