I've released version 2 of the game's demo, which mainly contains balancing changes to make the levels more challenging.

These are the changes, which will also affect the final game:

• Trash Cans now have a base price of 150 Scrap (from 120), which increases by 50 (from 20) every time they are bought.
• The Trash Can's production upgrades also increase in price whenever a new Trash Can is bought.
• Enemies walk slightly faster.
• Musket Soldiers have more health and longer shooting range.
• Reflected projectiles from the Tennis Player deal slightly more damage.
• The difficulty ramp-up between each round is a bit higher.
• Increased the default difficulty factor of several levels.

This new version also includes reworked music and a fast forward feature, which you can use by pressing buttons on the HUD or by pressing "1", "2" and "3" on the keyboard.

There are more details available in my previous devlog: Link