What I'll do different next time:
- Continuously test on a different computer (without VS, awesome GPU and a lower resolution)
- Implement Menus first
- Set aside more time for optimization
- Spend more time on game balance and content
The end result isn't very fun to play but at least it's bug free, which for a rapidly developed c++ game I am impressed with.
Here's a screenshot of the final product and if you should feel like it, you can download it here.