It's not bad, but not great.
Kind of a clever game, I'll admit... but there's a simple trick to the game. I don't know if this is intentional or not, but after a number of chops equal to the level number you're on, there's always a one- or two-second break (for example, on Level 5, it'll chop three times and wait a brief moment, then chop twice more and rest for two seconds before repeating).
Once I realized that, the game was extremely easy. I got $8,666,688 on my first try.