Spin-off of Project Hoppy Beaver Extreme

We've walked through the most basic version of this game, and hey, it's also pretty easy. Now that you understand it, try to make it more difficult and interesting. Here are some ideas for what you could do:

• Invert the collision mechanism - make it so that the beaver has to get through a hole, without touching the sides.
• Add obstacles that decrement the score - like bad sticks or holes in the ground.
• Add NPCs- characters that attack the beaver, and have programmatically controlled movement of their own.
• Add multiple levels, with increasing levels of difficulty (like new types of obstacles).
• Add a cooler win state.