Quote: "You can also tell me what do you think about it and give me some advice."
I'll be honest with you, I don't think this is ready for green light. early access 'alpha' games on steam in practice are well beyond actual alpha states. if a game isn't already well polished and nearly complete, it isn't ready to present on steam. impatient, opinionated young gamers on there will take one look and tear it up. you have one shot to catch thier interest and that requires great graphics, fun and easily identified game play, and/or something really compelling and unique in a good way. explanations and excuses will not change the public perception.
this is meant to be constructively critical, and I hope you will take it that way.
more specific to this game, it is too random to be taken seriously and not random enough to be taken humorously. with modern gyms and clothing, gladiator armor and swords feel out of place and shoved in. add in bars, dance clubs, zombies and it begins to feel that any random idea was just tacked on for the sake of having it in with no regard to how these things fit together (or don't)
the concept needs some refinement. if you want a serious game, drop the zombies, pick a time period and hold to it. if it is modern with jeans and gym weights, drop the sword and armor, or modernize it maybe replace it with a bat. if they want to go humorous, really make it wacky and over the top, make it absurd where people go WTF? while they are laughing. this is harder to do well, but allows for lower graphics quality to be more accepted.
I would suggest posting a wip here, give the project a chance to get feedback and develop in a community that understands the effort and difficulty that goes into making the game before presenting it to the critical public for sale. there are a lot of people here willing to help and support a good project.
think about it, good luck.