Other than the rest thing, my only other suggestion would be to add an option (like a tick box?) for auto-attack back for those pesky aggressive monsters ;P. Otherwise, 5/5.
For Level 16 on epic, i used: HEROES: Veigraf, Cassandra, and Kara. TROOPS: Untamed Beast, Phantom Ghost, Mad-Bull, Were-Tiger, Valkyrie, and Lord of fire (You just need melee). The only spell i used was Shield. Start up and attack straight out and use Shield as soon as you hit 106 Mana, and just keep using it whenever you can after that. (All troops, heroes, and spells maxed)
Ok, i take my previous comment back. It really does take long time to beat a level, but i guess you wanted it like that due to how few levels you have. my only other critique would have to be how a ranged unit will move closer to the castle each time it fires.
interesting and funny game, had to find 11 pencils. I got to level 11 and 50% to 12 in less than a day seems pretty fair because of the way you made the xp jump big time.
i played for like 2 hours...then left the page assuming it would save...came back...it reset me....i rated 4/5 first(because of the impossible stuff) no i revert to 1/5...