Awesome submission! I got to wave 18 and I really enjoyed the stressful feeling of everything falling apart around me. I also really like the idea of having to be careful where you place modules so that you can keep moving around freely. Controls felt smooth and I was able to get right into playing with little learning curve.
The only criticisms I have are to do with the art. Overall, it works well for the game and everything is obvious, but the projectiles having a smaller pixel size than everything else is a little strange looking. Also the UI elements are not distinct enough from the game elements and I got them confused a few times. Finally, the butt end of the guns look like they would be the barrel and I expected projectiles to come out of the wrong end.
Overall, awesome jam submission. Really impressed you pulled this off in such a short time!