This game has a memory leak of some kind or another, where the game devotes resources to a task, and then doesn't ever un-assign them. to solve the slowness or laginess, I recommend clearing your cache.
stop complaining, he updated it because he decided. so stop bitching about the lack of auto save, there was probably a legitamite reason for it. and if your wall needs more health, upgrade it, it is supposed to be challenging
for those of you who claim this game is too difficult, you might want to consider using strategy, and intelligent thought on how to beat the bosses, the first boss is very easy, as long as you think logically.
Hint:think about elements, lightening on lightening is uneffective
Clear your cache :D