Cool idea! I went into this expecting a Dig Dug type title, and then realised the gameplay loop is more action-based and about the slowly intensifying scroll that keeps the player moving. I think the game's rhythm lies best somewhere between 4 to MAX and that pace worked best to move quickly but still be able to manoeuvre around. That said, I love that the player really starts out feeling like there is no threat and absolutely gunning for dirt to stay alive by the end! Fun idea to make the music speed increase with the game speed to make the player sweat. The idea is simple and super effective.
Otherwise, for feedback, I'd say think about balancing the scores a little - by MAX, the player has no real ability to survive, but the incentive to go for anything but gold blocks, which are 15 times the value of blue blocks, means that the optimal strategy is really to die trying to hack one last gold block open. Plenty of options to expand this idea, with upgrades, more block types or challenge modes.
My final score was 5,620! I should have got more gold blocks whilst I had the chance...
Thank you for checking out SYMMACHUS and I hope you had fun making Mini Miner for the jam!