I'm long overdue with reviewing this one.
In short, its a gem. Out of all roguelites, Catacomb kids probably has the most ROGUE to it, despite being a 2d platformer. Its packed to the brim with cleverly implemented mechanics and interactions. "I keep discovering new things whenever i come back to it :D" is unironically the case here, I just wish the game somehow hinted towards certain things better.
The difficulty is brutal, the game wants you dead, but it also gives you plentiful of ways to approach fights, avoid danger and restore health. It doesn't kill you by attrition which so many roguelites love to do. You can also turn off permadeath if you feel like it.

Being a very complex passion project developed by a single (1, uno) person, i don't see this game leaving EA anytime soon, but whats already there is much more impressive than 99% of complete games of this genre.