You ever get tired of using the same cards over and over in Slay the Spire (great game btw)? This game's got the variety you're looking for! Thanks to the color system and the first boss being another playable character, not only can you get some wildly different runs, but you can even combine characters' card pools to put some absolutely absurd danmaku in your deck. If you're looking for a roguelike deckbuilder that you'll hardly get tired of replaying, I suggest giving this game a whirl.

You can compare it to Slay the Spire all you want, but this game add a lot to the recipe including mana management, double decks and a lot of fun cards to break the game.
My only problem would be that some event are pretty much useless compared to other and that the difficulty tends to fall down at the end of the run.

I'm 50/50 on this, but deckbuilder fanatics will get a great kick out of this one.

What I adore about Slay The Spire is the upfront simplicity that hides a lot of depth and strategy behind it. You have energy, you play cards, cards cost a certain amount of energy, done. There is a very large amount of strategizing to be found here, even then, but it makes the game feel less overwhelming.

This game makes every single combat feel like you're playing The Watcher. The main gimmick of this game, what sets it apart from Spire, is that energy is based on Magic The Gathering's "mana" system instead, meaning you have different colors of mana available each turn, and cards use certain amounts of each. You don't just have "3 energy", you have "3 red energy and 2 yellow energy, unless some opaque mechanic in the current fight changes this". This drives the complexity up by a factor of 100, which I'm sure people with many games of Spire and Magic under their belt can appreciate. But me personally, I don't really like it. The whole point of Spire is that it had that simplicity going on.

Combats are a bit overtuned. Imagine if the hallway fight in StS with the 3 Louses was actually 5 Louses instead. I guess the game is still fine, but I consider myself pretty good at Slay The Spire and find myself constantly getting rekt at Act 2. There is an Easy Mode, but it locks you out of the last act. Why? Because Touhou did it. I don't think they really gave this any thought, they just blindly copied what Touhou did.

The potions system has been replaced with spell cards, which frankly are nowhere near as deep. Instead of stocking up on a wide variety of potions and using them at the right times, you now have a single pre-assigned spell card that just hits the enemy really hard, and you charge it up just quick enough that you can use it on one elite and a boss. The strategic depth here is gone.

Referring to what I said earlier, where every run feels like you're playing an even more complex Watcher... there's less heavy math and setups involved than what Watcher has, but the player is overwhelmed with way too many statuses, special effects, buffs/debuffs, card effects, and more. I can't follow anything that's happening. There are too many rules and exceptions. Every turn, 6 icons flash across the screen denoting some extremely gameplay-altering mechanic that's been applied to either me or the enemies. That watcher meme of every card being an essay like "Scry all karma, enter downward dog position, if this was your only Skill this turn, die next turn and put this card on the freaky pile" comes to mind.

Thanks to the mana system, card draw feels really lackluster. Sure I just spent 1 mana to draw 2 cards, but what good is that? Most cards that aren't basic strikes or blocks cost insane amounts of mana and I never have the right colors. I draw 6 cards total at the start of my turn but I can only play one card and a block, and that's it. Why am I even building a complex deck when the one thing that actually wins me runs is just spamming mana relics and only taking low-cost cards that are actually playable?

So then why the positive review? Well, the game is pretty good still as it stands. I can't wrap my head around it at all and I still think Spire's simplicity wins out over this game, but someone who really enjoys sitting down for a very long time and bashing their head against a game that's way more difficult might enjoy it a lot. Personally I think the fact that every boss allows you to choose to branch out into different cards or different mana pools is interesting. StS's boss relics generally take away some gameplay aspect to give you more energy (such as no longer being able to heal at rest sites), this game instead opts to hand you more creativity and control to build your own decks.