not bad, i dont know if there are more towers later in the game, but if there is not then you should make some, and also you should put in a speed up button
theres a nice little glitch were if u hit the blob right it gets stuck on the ball then u just leave the ball in the air for as many points as you want
45 was kinda hard but i beet it by just putting like one of everthing in the cross in lvl 1. i really didnt think i was going to win, i was just trying to find all the combinations, sadly the last 2 i found were the most godly, life + on kill and maching gun are amazing to have