Orbital Defense - first demo

I've been slowly working on my tower defense game set in space. Unlike your typical tower defense with static weapons, your weapon platforms in this game move with the planets they're orbiting. This can lead to interesting tactics as you can build platforms geared towards the enemy spawn point closest to your planet. Protect your planets. Enemies will move like a swarm from planet to planet until humanity is destroyed! Enemies aren't your only threat. Various asteroids and comets spawn from the edges of the solar system. Though unlikely, it's possible they can strike your planets and doom them.

I finally finished working on the first level today which I'm using as a demo to get feedback. While the first window provides the basics in terms of controls, I'll post some information here about the weapons themselves to help you better decide what to build and when. Currently there are only 4 platforms but I will be expanding the number and type as I work on the game.

Basic Platform: Sports two cannons which deal low damage and have a medium range.

Multi Gun Platform: Each cannon sports three barrels to triple your offensive power.

Light Missile Platform: Sports two missile launcher launchers which launch volleys of short-range homing missiles. Good for swarming enemies that get close.

Cruise Missile Platform: Shoots several long range homing missiles. Great for softening up targets before they get into gun range.

This is a tower defense game, which means you need resources in order to build platforms. There are two ways to gain resources, destroying enemies and keeping your resource stations alive. Each planet has one and each station sends out cargo ships. Once the cargo ship reaches its destination, you'll gain the resources it was carrying.

Please try this demo out and let me know what you think and what can be improved.

Download Demo