Unfinished product with no real end-game loop.
Should be marked as "Early access", this is not a full game (check the patches history, and decide for yourself).
HoH1 was a much, much better game overall.

All maps feel the same—the only difference between runs is the layout. Itemization is uninspired, merely adding stats without meaningful impact. Unlocking everything separately for each character feels like an artificial time sink. Right now, the game lacks engagement; at the very least, there should be more variety between runs, since that's the entire gameplay loop.

I’ll return in a year to see if things have improved.

Initially super fun.
After you've done NG it's just a really unrewarding grind.
You just go through the same exact halls over and over and over again killing the same 3 enemies over and over and over again.
The "builds" you get each run consists of either more damage, more sustain or more resources. None of which feels like it really does anything. Nothing is build defining, it's just so same-y every single run.
Only difference in builds is "Your damage is now ICE instead of FIRE! WOW!" pretty much.

I haven't done the alt-grind yet, because the only fun variety is the subclasses - And it takes WAY too long to reach level 10 to even try out or explore the subclasses on each character. Just another unrewarding chore.

My biggest problems with the game;
-No variety, all runs feel the same. Only exception is the odd run getting only absolute garbage items and it's a bigger chore than usual to get through the levels.
-Too many same-y enemies for the amount of HP they have, it's a chore to slug through the levels when you're level capped. There's no reward AT ALL killing enemies, and there's a metric f*ckton of them everywhere.
-Way too expensive meta upgrades (Camp upgrades)
-A lot of character-specific meta upgrades feels like they should had been shared across characters, I don't want to redo my grind 8 times or however many classes there are for basic upgrades. At least not when it's so expensive. Lower cost and it would feel completely alright.

My impression of the game after having played HoH1 as well; Lazy cashcow with bloated grinding.

On the plus side, it controls really well and it has very fun gameplay if it wasn't for the extreme grind and lack of variety. Would've been a pretty good game if the fun factor was QA'd properly. If it was also expanded upon and wasn't so tiny it could've become a great game even.