I chanced upon this free web game when a Jonathan Blow clip got pushed to me, where he and his chatter were talking about what a great game it is.
It's actually an insane game which combines Minesweeper with RPG elements. I'm at a loss for words when I was 10 minutes in and even more stunned once I completed it.
I liked how every unknown interaction to the player has 1 layer of mystery. They are easily derivable and makes the player go "ohh!" quickly. The interesting thing is that the more you discover such interactions, while it makes the game easier, it adds a complexity to the player's strategy and makes the player feel smarter.
One of the interactions I really liked was that the only 'wizard' in the game is always surrounded by purple slimes. Since there are always 5 purple slimes, the wizard could only be at the edges of the grid and not at the corner, so the moment you suspect that there is a slime behind a cell, you can actually avoid the slimes and go straight to killing the wizard (which will drop a scroll that reveals all slimes. Revealing stuff is useful).
Another interaction I liked is that rats always face left/right towards their rat king. Killing the rat king will drop a scroll that reveals all rats.
There's probably more to talk about the game, but I think that it's a very good game to have a case study on. I haven't felt this much joy playing a game like this for a long time, and it reminds me of the endless hours I put into Desktop Dungeons long ago.
I'm going to closely follow the developer and maybe consider playing Fidel, which is their game on Steam.
11/10 game.