Game Polish and Fixing Some Edge Case Oddities

Changes:

• Lowered the background music on the title screen and main game to -6db, I love the music, but it was a bit too loud!
• Adjusted some pixel positioning on a few in-game objects as some were still not quite perfectly aligned with the ground or each other in the case of the lights.

Fixes:

• On one playthrough, my brother was able to drive the cat through the floor in a very rare occurrence after the cat was hit directly on the head by a high-velocity ornament! Poor kitty! Additional checks in the kitty code have been added to ensure the cats stay on screen.
• On a separate occurrence, another user was able to knock off one of the ornaments directly after placing the final one to complete the level. Although the game still went into the win animation, it looked a bit odd to have one ornament knocked off of the tree it its final state. An additional loop has been added to set all ornaments' linear velocity to zero directly after completing the level to prevent this from happening.
• Fixed a bug where the "Thanks for Playing" text was not showing on the win screen. I am still unsure what was happening there as all settings look correct, but I have simply added another line of code to ensure that the label is showing, and it seems to be working now.