Sentinels of the Void V0.2

I've added 2 towers, making a total of 4. Each unit can also be upgraded.

Firstly, there's the astronaut. This is the cheapest unit, and has good range and power. This unit can be upgraded to double damage.

The drone costs a bit more, and a smaller range, but it attacks twice as fast. To fix the range, you can double it for an upgrade.

The chief is even more expensive, but can shoot twice as far as a drone. Since the bullets have to travel so far, you can double projectile speed.

The turret costs twice as much as the astronaut. It attacks 3 times faster than the chief, and the range of a drone. Attack speed can be upgraded from 3 shots per second, to 4.

10 waves have also been added to a total of 20. These waves can choose from 4 enemies and 2 bosses. The void walker is the most basic enemy. The void speeder is 3 times as fast. The void gnat has twice as much health and is twice as fast. The void beast has 1 speed but 5 health, to tank hits. The first boss, the void brawler, has 2 speed but 32 health. The second boss, the void panther, has 4 speed and 64 health.

There are 2 extra maps, not much there.

Other random changes, you can sell towers now. You can press on a tower to get information on it, such as the amount of enemies it has killed. Towers can't be placed on other towers and can't be placed on the path anymore.

Lastly, there is a persistent starry background. Stars appear and disappear over time.