Impressively well designed. If you're a fan of randomizer roms or just roguelikes and jrpgs in general, definitely worth giving it a try. To be more specific-
The loot spread is good. While many games with randomized loot often throw trivial modifiers at you like +3% damage on a full moon or whatever, the items here do cool stuff. A weapon that casts elemental magic when it hits, armour that grants 50% resistance to a type of damage, accessories that do things like make you 50% more likely to get hit, or give you 50% chance to counter attack when hit. And even weirder stuff like making the character auto-use a healing item when injured at the end of the turn. Great stuff. There's boring, weak items too, but the good stuff is common enough to keep runs fresh and interesting, incentivizing you to rethink your plans for the party.
The monsters are good too! They have wildly varying stats; some will dodge basically every physical hit, forcing you to use magic or an attack that cannot miss. Some counter your attacks, or spells. Some can revive allies, or become invulnerable for a turn. And that's among normal enemies, the bosses are even better. And there's a lot of variety between runs; you won't be facing the same wind elemental enemies on the 4th floor every time like many roguelikes end up doing.
The character build mechanics are cool! Each character gets only a single class for a run and has nothing to customize about that, but when you hit milestones every 5 levels you unlock an active or passive skill from that class that can be equipped by anyone. Combined with equipment, it gives you a lot of cool options, like giving the knight's taunting ability to a rogue, so they can taunt enemies after stacking a ton of evasion, becoming a dodge tank. Classes are unlocked through a variety of achievements, like using a particular ability X number of times, reaching a specific floor with a specific class, or using every single magical element at least once. Makes for fun side objectives during a run. You also unlock special physical attacks during runs with a sort of 'learn by doing' system, which resets each run. Basically, if your whole party is using longbows, they'll all unlock all the cool ranged attacks very quickly, whereas if everyone is doing a bit of everything, you'll take a lot longer to unlock high level moves.
Speaking of unlocks, the meta progression system is fun too. You simply earn currency during the run you spend to unlock perks, but the perks do impactful stuff like unlock new gear at the shops or improve the loot you find. What I like though is that you can skip some upgrades- by taking the third tier of the 'start with some free gold' perk, you save currency compared to if you bought all of the first 3 tiers in order. Of course, you might get farther and earn more currency by taking those early tiers. Adds a bit of extra strategy to getting the most bang for your buck.
The UI is done well, with proper information about what items and spells do, what stats your character has (including odd ones like item efficacy or chance to be targetted by enemies) and even a nice little bestiary that keeps track of things you learned about enemies you've fought before, like weaknesses and stats, along with a tip about how they behave.
If you don't mind the simple graphics, lack of story and rpgmaker trappings, it's a fantastic game. Absolute win for anyone looking for gameplay above all else.
