As someone that has 100%'d PvZ, I was able to finish it first try, I always make the first 2 rows all sunflowers, and the roof as well in this case, which I was able to get rid of half way through after I made a massive fortune, and just went to town with repeaters, with 1 row of ice bois, 1 row of pototoes, 1 row of chompers, 1 row of pototoes again and repeated the last 2 rows with more chompers and pototoes, but still lost my lawn mowers right at the end