Love the idea, combining two of my favorite time sinks from differnet eras of my life (roguelikes and Minesweeper)! I did feel like the game either never gets too hard, or takes too long to ramp up. I played for about an hour waiting for it to feel less like normal Minesweeper but I could still beat every level by playing normally and the powerups felt too passive in the sense that I wouldn't notice their impact and often forgot to use them to my advantage for the extra goals like minimum clicks, time and whatnot. I think the game is great and love the music and artstyle but it would benefit greatly from becoming a little bit more hectic a little bit faster.
I totally get your point, and initially the game was way harder :) but since the game rised in popolarity, many people found it extremely frustating, so I tried to adjust it accordingly to make the best experience for everyone. There's currently an hard mode unlocked for each class when completing a run in normal mode that should give some challenge, and more challenging modes will surely come in the future. Overall the game right now gives you a lot of resources to work with, I'm still trying to fine tuning that