Hello Oliv.. hey Adlertag
About your q :
1/ Tutorial : not existing yet but the designer/programmer is planning to make one (non-interactive). For the moment you should (and maybe have) read the manual that has a "Getting started" section, and learn on the field !
2/ Campaigns : no, there isn't, and it's not planned.
3/ Maps : they're rather small but the game is designed for that, units don't move very fast, and it takes some time to cross/explore the map
4/ Tooltips : yes you don't get much info about what is possible or not before trying, the game is rather unforgiving indeed... But it comes fast after a couple games
5/ Similarities with StarChamber : the basics are resembling, as both are a mix of card and boardgame. But AE has no "collection" aspect and fewer cards (with a narrower choice of types/effects, more like wargames "units"), games are longer (2-3 hrs a game compared to 30-60 min for SC IIRC), so maybe AE has less "combos" or deck ideas. But AE combat is more detailed and involved, also it has some "indie" units/sites à la Dominions plus, you can create stuff.