Interesting idea. I liked the dynamic difficulty of a building a horrible murder machine which you then have to dodge yourself. I think the game would have benefitted with a few tutorial levels with premade weapons, so you can understand what's useful and what's not. I worked out that the top layer could be made to rotate separately, but didn't work out why that was useful! I built a horrible scissor machine (attached) but it got gummed up with enemies! As other commenters have said, having slightly better control of the machine would improve the game a lot. Good job!