Algodoo

Title says it all. Start the sim and press enter to shoot.
Although the projectile energy when shot is only 200J in median, it only has 1 bullet.
The bullet is buggy. Sometimes it fails, sometimes it's devastative to the wood building.
Think that you can do it better? Try this challenge:
Challenge #1: Make it smaller without making it weaker
Challenge #2: Make it more powerful without making it larger
Challenge #3: Make it more accurate without making it larger and weaker
Challenge #4: Make it aimable
Rules:
1. Must be built from scratch
2. Use the wooden building from that scene
3. Pistol has minimum 1 bullet
4. Must be shaped like pistol
5. No Thyme/Scripting
6. Use button to shoot
Good luck!