Gargoyles are definitely very over powered and according to me the main flaw is frosters not able to kill them.
You can kill an ogre easily with arblasters.
You can kill a mummy easily with pyromancers.
You can kill a werewolf too with frosters and blade storm etc.
You cannot kill a group of gargoyles with a swarm of maxed frosters. THIS IS SO WRONG.
Game is more enjoyable when peoples inteligence is put to test. For defence, just Gargoyle and anyother troop to fill if you have less than 4 points availble is all you need. Bladestorm seems to be doing hardly any damage to gargs. I only see them die with Sonic Blast, provided I activate it before they reach me. Swordrain is left around level 7 once higher level spell were aquired and it doesnt seem right to use it and also the cool down is too much. I dont like to see all monster bases as that is not fun. I do like to use mummy(Level2) for now in offense now and then and just aquired level 4 ogre. Tested to see the Ogre with my own base with level3 gargs and still no change to survive. I dont like my base with almost 3 wave dedicated to gargs but i guess i need it to survive till a solution is implemented.
Make them die to frosters by increasing their damage - MUST
The time for it to explode (Dunk time I call) should be atleast 2 more seconds for hero to escape and if any frosters present for them to kill. - MUST
If limiting monster usage is being considered, then limit the total moral points you can use. May be like 82 max for all waves together. If player decided to use if for 20 gargs, let him use with frosters as their nemisis. They can use 5 werewolfs in total or 7 ogres and that is a lot.
I strongly believe limiting the usage of each tower should also be implemented. I prefer no more than 5 towers of the same type. This way, even if you use 5 each of Fire, Snake and Skull, you are still forced to use one more tower. This will help people to use thier intelligence and use a variety of stuff.
Currently, If you are top player, you can build a base blindly with fire + skull and may be snake towers and have gargs in waves. You are guaranteed to be unbeatable without scrolls. Scrolls should not be needed to a skilled player while attacking his comparable players base.
Offensively, I believe no change is needed for monsters.