What a fun little base builder! The moment you give the option to generate resources the games balance broke :D I had somewhere in the 60 factories Really well done, but I do wish I could have gone more under water :D
One bit of actual feedback though would be that you don't have to select which block to place next every time. Or give me the option to hold down shift for example (a very common key for this) to keep placing the same block.
Behold my "Boot of UFO Butt Kicking"!