the healer, never even saw him
. i only found the archer and the time-doubler.
i just managed to beat the shadow wizard though, although just barely and with a lot of thinking and my final 2 hitpoints. at first i was thinking it was impossible after he spawned his 3 skelleton (then i noticed his energy is limited). I also nearly just ran from the dungeon, but decided to fight it out. must say, i did spend quite some time and the boss was satifying (probably would have been pissed if i had lost).
my main issue was at first: i did not understand that clicking the cards changed my next attack (first comment). i then tried the game again. after unlocking the archer i was thinking i now had two attacks (didnt notice the archer skill takes energy). i only later noticed my main character can have a power attack. i would be cool to have a very simple introduction to every character you find. e.g. for the main character: let him destroy a rock that requires the high-power attack.
having a healer would be nice, as for me it was highly luck based. i just had to find a healing-card. with the archer and the time-mage i did devise tactics to kill all enemies unharmed. the only issue is when you are cornered, surrounded or out of energy
edit:
the camera is a little disturbing at times. its hard to orientate and you cant see whats below very easily (maybe center the character higher up or allow more zoom-out)