Luck based strategy
I played easy mode just to get a feel of the game but was still met with ridiculous amount of difficulty. one problem being as soon as the lvl starts your people run and find random non-close locations to camp at making you spread the limited mana you begin with. Unless the enemy was unlucky enough to start on an island I noticed while spying one enemy would start all the way south, go all the way north and then start camping while your units will camp in any available space. The spells add a nice touch but prove pratically useless except for thunder staff which was overpowered for being the cheapest spell.
The thunder staff could decimate a temple and half the time the person who made it! Whether they died from the ligthning or from drowning.
Disease only works if you cast armageddon because it doesn't work on houses only people and since it spreads you only really need to use it once.
Swamp will instantly kill any person making it just like plaque only worse because if you wait till you cast armageddon you will kill your troops as well including heroes!
Scorch was 50/50. It makes all enemy houses go back to lvl 1 meaning less mana and population. This helps if you are a war tribe but then you have to spend extra mana to restore the land so you can build on it.
Create hero= absolutely worthless without armageddon. The hero will throw painfully slow spears often destroying building in one shot. Although it sounds nice once the building is gone all the enemy has to do is run his little 50 to 100 hp butt right back where the building was and boom another instant temple which often lead to an unending building and destroying sequence. Not only that even if your hero has craploads of hp (mine had 55k!) If they hit your hero with thunder staff or destroyed the ground under it boom dead in mere seconds.
Lastly armageddon. Armageddon destroys all houses and lets your people go wild on each other. Casting this spell makes the usefulness of every spell go up by more than 500%! It also acts as an easy victory if say you own 60% of the board and you want to end the lvl without waiting 30 minutes for your people to do it by themselves.
Things that could be added
Different color tribes
Multiplayer is a must!
buyable weapons and building materials
a tutorial showing each spells used to it's fullest potential
an ending. once I beat lvl 16 on easy despite their being 20 lvls it sent me straight to normal.