yeah the breakdown is every 5th level the effectiveness increases and every 50th level the special ability increases. I thought about making the pickaxe follow the mouse instead of chasing rare blocks to give the player some control later in the game but opted to test this as is for now.
I also considered making unlockable cards the player could pick from at the start of each run. This would give a more rogue like feel and change each run a little based on the players choice. That would be a whole lot of work though haha.
Thanks for the feedback!