Great Game! Here are some tips...
I've enjoyed this game ever since it came out on NinjaKiwi. There are a few tips I would like to share with everyone here.
First off, the 4th upgrade for the tack tower, the Ring of Fire, is incredibly overpowered. With a firing speed twice as fast as the bomb tower, the ability to pop anything, and their relatively low price, compared to the Sun God, they are amazing. I managed to get to round 112 using just these and banana farms for extra money.
Secondly, when you get to where it is lagging like crazy, turn off the music and minimize the screen. Without the need to visually display everything, the round that would have lasted 15 minutes will take about a minute and a half.
Finally, use the Mochi save feature. It's free, and you can save as long as you haven't entered free play mode. I usually save right before the regular levels end so I can just skip to the free play mode.