(Author's note: This is specifically a review of DLC. The base game is amazing and needs no review.)
Finished all the DLC that came out since I put this down in summer (post-Moonspell). I got it all at the same time (some was free) so I'm hoping I've sort it out correctly.
Whiteout (1 new map and character? and weapon); the weapon is pretty good, it's another "stronger with movement" but also strong against frozen enemies setting up interesting combos. The map was meh. Hilariously, I didn't even know there was a new weapon because I started with the Among Us DLC and on one of the runs, I got a Candybox (and just grabbed an old standby I think), and then later in the same run got a Super Candybox II Turbo and actually looked at the choices and was like "why don't I recognize this?" So of course i took it. At the end of the run, I unlocked achievements for getting the base weapon to 7 and evolving it. It's not cheating if the game says it's not!
Emergency Meeting (Paid DLC, Among Us crossover). This was fun. Some absolutely broken combos but really great job on the theming and probably even better if you've actually seriously played Among Us. You'll easily get a few hours out of this, several new characters, tons of new weapons and passives, a new complex map like the mountain from Moonspell. This is an absolutely broken map where you can pick up every new passive from the DLC and one weapon which is terrible until you evolve it, at which point it's broken. (It was always a 7th weapon I picked up later. Mad Groove Arcana OP here for just teleporting all the items to you, but for extra OP, max out your passive slots with staples like Attractorb, Candelabra, etc. before you start picking up the ones on the map.) The "Report" weapon which upgrades to "Emergency Meeting" -- the latter executes ALL of a random enemy type periodically, and this isn't even the most broken weapon in the set.
Adventures: An interesting mode where you enter a side adventure (roll credits) where you start from 0, possibly with some coins depending on the adventure. There will be special remix versions of maps and you'll have a single character to start. Your base relics come over but that's it; you don't even have the Grimoire so hope you remember those evolutions (the Internet does if you don't)! It's like a mini-story where there are 6-8(?) steps you're supposed to follow in order, like "survive 10 minutes on this map" or "open the coffin on this map" ... you don't have to go in order always, but sometimes the new map for the next objective is only unlocked by the previous one. Each adventure has a small subset of characters and weapons/passives available, though you can use adventure-gold (does not carry back over) to unlock anything from the main game (including DLC) for use in the adventure. There are 2 for sure that should be free, 1 more was themed around Moonspell so probably requires that, and 1 around Emergency Meeting (this was a fun way to experience everything the Among Us DLC had to offer). Some of the challenges were hard, even after completing everything the base game had to offer; so many times I was getting to 28-29 minutes and just not able to hold on for that magical 30.
Well worth picking the game back up and at least checking out the adventures that are free. Two thumbs up for the Emergency Meeting DLC as well. Wait, why are there 4 thumbs? Oh no, it's the impos... [THUD]