lvl 13 (tricky part) shoot the laser to the left and use two mirrors to power the line with the bot,the bot should be underneath the bottom mirror, use the bot to move the mirror to the left using the grey block to stop it underneath the upper left mirror.
I'm stuck on 14
to beat 17 I used devils and angels and whatever magic user you have driads/totems/wizards
level 16-I used hobbits to keep the frog from moving in too quickly. use your titan
note to game maker: bothersome to have to upgrade your stats each level.