Much too easy, on my first playthrough I didn't even upgrade my equipment or health and easily finished the bosses. I am not even very good at dodging but the javelin makes it easy to sit really far away from the boss and still deal lots of damage. On new game plus I just maxed out javelin and boght the bst sword and easily killed all of the bosses. I think adding something like a roll or dash to increse evasion will allow you to add more bullets on screen at the same time, making the game be a lot easier if you learn the skills and still be challenging. The bosses are not rewarding in the slightest to kill, just giving enough money to upgrade once or twice.
Are you kidding me... I spend a good painstaking half an hour or so grinding up to 1k coins to unlock the tower spot and I have to pay another 500 coins.
I really hope that one day eddynardo makes a big game and releases it on steam or something, I'm sure that everyone that has played these games would be willing to pay for something like that
You can try increasing your happiness! Also, try researching birth control at the medical clinic and choose Encourage Parenthood.