So, here's a general gist of the game (too lazy to point out specific options)
Your 'goal' is to have the princess knight keep making progress in the dungeon without going 'screw this, I'm out' and teleport outside for whatever reason.
(she'll be back, and you're given better starting items based on the floors she reach, though in trial this is just for reaching floor 1)
She has HP and attack power, and she can gain exp which increases her max HP from defeating monsters you set out.
Each floor start in setup phase, where you can put down (or don't) things into each circle on the floor.
Monster (practically all of them have combat H)
Food
Trap (seem to be the main way to break her armor)
Treasure (potion, equipment)
Rest zone (has scenes possible)
Or just leave it blank.
Each different tile you chose also affect her 5 stat slightly (for example finding a treasure reduces her wariness)
After you put out things however you want, you select end phase and she'll go through it, either successfully clearing the floor or go home for any reasons.
(you haven 0 influence on the combat itself, so for example even if you put down an orc in hope of it raping her, if she resists the tackle enough then you won't see any)
There's actually 7 ways for her to just say screw it and go back.
5 of them is to 'max out' one of the 5 stat (Wariness, Fatigue, Lust, Hunger, Cleanness)
another is for her to lose all HP in combat
and the final one, funnily enough, is if your floor was BORING (you need to put down at least 1 boss-tier monster)
Each floor you're given up to 10 MP, and you can use them for either
1. Alchemy - 1MP used to Combining monster + something else and if you got the right combination you'll get better monster as a result (in the trial, there's 3 basic combat enemies, 3 upgraded ones and 2 bosses)
2. Searching for items - 2 MP used to pick a monster and send it to find something, the first time you send a certain type of monster it'll bring back a special item after that it's generic.
Note that at the end of each floor, any monster type that you have at least 1 of them left will create more (silme duplicates, goblin call for more goblin, etc) so in the full game + not using cheats this'll be something to consider.
And just as there's tiers for monsters, there's also tiers for items. In the trial sending out tier 2 monsters will find tier 2 items (food that better alleviate her hunger for example)