I liked it. It was a fun little game with an interesting mechanic. I did feel like there were two walls where I had to wait a bit to be able to afford the next section. The first was between the 4 and 6 upgrades. With nothing for the 5 tiles I had to idle a bit to afford the 6 tile upgrade. That got me pretty smoothly through the rest of the game until I hit the 9 tiles. Then I had to idle again as the shards dropping didn't quite keep up with the cost of mining a 9 tile.