Thank you ! The ideas came by trying to trick it, actually. At first the snowball wasn't melting so you would just clean the path and go back safely. Then, ennemies were not hard enough so you could just go past them. And at the very end I added the fact that you can't throw if you're behind your snowball, because it was way too easy to just roll and throw balls through it ! I like the result at the end, it was really not that obvious at the beginning of the last day ;)