A few thoughts:
- There's a real conceptual conflict between "if you position the cursor over the right set of items, they'll be worth more" and "this set of upgrades speeds up the cursor and gives you less time to position it correctly".
- The skill tree could really use clearer distinctions between "too expensive", "able to be purchased", and "already maxed".
- I personally found the cutting tool very hard to use (on a laptop)--not easy to position it or to move it at exactly the angle I needed.