I got very unlucky spells from the first monster, restartin the game let me able to get sligthly better spells and finish first level. Now I'm facing an interesting battle in 2nd level wich need some thought.
[spoiler]
Hard Mode guide - Starting:
Well even in Hard mode the first battle (a fungus) is easy. If you can't defeat 1st battle you better gain some experience at lower difficulties.
2nd enemy should be the Treant, Use your fungus to kill all treants as soon as you can. When enemy has no mana, they don't regenerate! If enemy has still 1 alive treant at turn 4/5 just surrender and retry the battle. After that he will have enough mana to regenerate always them and to cast buffing spells.
Defeated the treant look if you have received following spells:
-Dark Forest (enemies with 3 power or less can't attack you)
-Hornet (any hornet is fine, but the one with 2/2 cost slightly less mana and is better)
If after 2 battles you don't have those spells just restart the game. (I'm serious, I was not able to proceed without them, and I mean BOTH of them).
Mecha Worm:
Start the first turn with Mana Bless (pay 1 ether gain 2 ether) followed by Dark Forest ( this makes the battle pretty easy, just retry until you start with both spells in your hand.. You can remove all other Forest spells from your deck and replace them with something more usefull)
Enemies will not be able to attack you (unless by casting a buff twice, in that case just block the enemy with a fungus or with a tick, the enemy will then die in 2/3 turns thanks to the buff).
Just wait until you can summon the Hornet, Buff the Hornet and you win in 2/3 turns (attack only with Hornet).
Level UP => I found very usefull the ability "Resources" (play all spell 2 times), this is enough to win against next enemy.
Fungus lvl 2 with 16 HP: Just take your time, this enemy has limited number of monster spells. This enemy can't really do any damage (he will wait you start taking Ether disturbance damage). You can kill it easy with hornet, hopefully he will sacrifice fungus to destroy your Ticks, so that your Hornet can work quietly. You still need to destroy its 2/8 Fungus with a 8/2 tick else the Hornet will be the next kill.
Now the game will be much more easy, until the first boss (Omega-400 "destructor").
This enemy is particular difficult, the only way is attacking it with 1 super-buffed Hornet (if you attack with multiple creatures you will just lost all your creatures, since at every attack he do 1 damage to all your creatures).
Blocking attacks from O-400 is pretty easy. Just use treants (keep enough mana to regenerate them), or you can also try the combo:
COMBO:
Spell that sacrifice a creature => draw 2 spells
Ether channeling => each time someone summon a creature you gain 2 mana (1 of this and you will be able to put into play ALL creatures with a cost of ether of 2, use 2 Ether channeling and you will be able to put into play a Hornet just by summoning 2 fungus).
The combo is usefull to draw all BUFFS immediatly and to setup a wall of blocking creatures, Is very usefull because if a creature get debuffed, instead of remove the curse you can just sacrifice it to draw spells.
The combo works very well also in the 2nd level (most battles done with the combo).
[/spoiler]