Reproduction bonuses are the way to go... I think that is what makes it so easy. Its still a fun game though and I enjoyed every second of it.
The realism is great and it adds a lot to the quality of the game 5/5
The boss at the end is impossible, I have hit him multiple times with the little line going through his gosh dang head while he is there and it still keeps him alive, even after I get the "landed a hit" thing. I rate this game poorly. Bosses are supposed to be fun, not frustrating and impossible