Solasta is anything but very well-balanced.

Their homebrew subclasses are either god-awful (Spellblade, Shadow Caster) or too powerful (Mountaineer, Shock Arcanist), while the game suffers from over-reliance on light/darkness and enemies that thrive in the dark, making picking races with darkvision a bit of a must for an optimal party unless you want a whole truckload of irritation added to combat with the game's primary antagonists and vampiric undead, out of which the latter are introduced way too early for how dangerous they are.

The pre-existing 5e cheese (Grease, Hypnotic Pattern) is still there though, so as soon as you hit level 7 on an applicable caster most fights with non-undead / non-elemental enemies can be solved with a single spell if you are having trouble. They did claim they made the final fight more difficult with the last update, though, so I am currently giving it another go to test the new classes out (Sorcerer is heavily bugged, with twinned spell freezing the game and making you restart fights on occassion), but I wasn't particularly impressed by it after my first playthrough.