Whoops, my b
. A lot of stuff to keep track of.
Basically you select a class and fight monsters.
Going more in depth, you earn gold and XP with every fight. Gold can be used to purchase stats (Health, Mana, Attack, Spell Power) as well as Health and Mana Potions. Each class has different scaling on abilities, some scaling off Attack and some off Spell Power and some off Health too. Skills are bought with XP vary widely and are universal for every class e.g there is a skill that does extra damage every time you hit the enemy, so you would want to rank up this skill with classes that have multi hit moves.
There are 2 solo modes so far, Campaign and Adventure. Adventure is like 1 sector of FTL where you jump from beacon to beacon and earn random skills. It is kind of like Pokemon's battle system mixed with FTL.
Campaign is where you fight as many monsters as you want before challenging the final boss. You can select your skills and go for the ideal build to beat the boss. However, the less amount of battles you do before facing the boss, the higher your score will be so there is a balance between that.