What I like about :
Starting was pretty good.
1 : I also like how he used zerg tech to merge time alien and many thing he achieved using tech from different world.
2 : Mixing of different worlds tech , techniques , magic to achieve new.
What I don't like about :
1 : mc is a idiot. He acts like he is smart (sometime he actually come up with good things )but some time acts dumb waste his skills don't use them at all when result can be near cheat like things(he has a skill which allow him to absorb skill of others and he visits different worlds like marvel , fate , Godzilla, mass effect etc and do not use it , he also has ability to re write whole fucking DNA of any species he wants at his disposal )
2 : pedophile and lolicon , borderline rapist.
3 : There is no goal.
4 : He is to casual about thing like introducing tech and magic into different world and acts like he want to collect girls as trofie from different world and bitches about when he gets a title: god of magical girl.
5 : He kills all people in America when he marvel in the name of justice wile saying that since people pays taxes and vote for government which causes injustice they should all die. In mecha world he just saves Chinese people because the are good people let all people die because they are bad.
Well you can enjoy this about 1000 chapters because i don't think there is too much racisms in starting and in starting when mc was not powerfully it could be considered good and skills he got from world had very epic potential (which he wasted ).
In latter chapters racisms is full blown like killing westerns , Indian etc and pedophile , too op mc