I hope this doesn't come out badly, but an attitude like "I don't HAVE to change anything" isn't going to help out your game. Don't kid yourself. Your game isn't terrible because nobody is agreeing with you, but rather because your mapping, system, demo is not the greatest (from what I've seen) and your game needs improvement overall. The fact that almost everyone is giving you harsh criticism is a symptom of your game being at best mediocre, and though it is neither the cause nor the proof of it, it should still motivate you to fix up your game to a standard where not only will you feel much more satisfied with your game, but other people will too.