the difficulty was perfect for me and i liked having a bit of stakes, but i do play alot of minesweeper, so maybe a difficulty for people who havnt played much minesweeper could be good?
i liked that there wasnt so much focus on the upgrades because i find just upgrading to progress feels kind of hollow, i felt like it complemented the game(sorta broke it up a bit, gave a bit more variety) withought taking away from the minesweepering. i also liked that there is the rail system as opposed to a speed increase, it adds some extra strategy.
something i didnt like was the shade of red used for the flags, they were too close in value to the ground color and would kind of blend in unless i was focusing on them, i wish they were a bit darker or adjustable. i also wouldnt have found out i could right click to flag if i wasnt familiar with minesweeper already, (i dont know who isnt... but you never know ig) so that might be another thing to keep in mind for beginner players