Very clean implementation, visuals, and audio. It also uses the theme well and stands out from other games mechanically.
If I had to critique anything, I'd say that the pace of the game can drag a bit when you get a lot of failure blocks in a row or a bunch of TNT basically stopping your progress. You get enough money to keep going most of the time so the balance of the game seems good, but the novelty of the slot machine roll wears off and it feels more like a chore over time having to wait for the slots to finish. If I could just speed up the slot roll animation that would give me an option to avoid that feeling once I'm already into the game.