Pretty hard tower-defence. It's easy to get a softlock without a gun, nor a drill. My guns are almost always destroyed immediately. I also guess the black hole drains all of our resources? Kinda feel like a reset without anything to make out for it, or I missed it.
I also don't really understand the health system, is it the colour of the particles around the ship? I guess they are to indicate the current cycle. Never went far enough to use anything else from the gun and drill.
Artwork and sound fit the space theme nicely.