What a fun idea. I usually try to give nice feedback, but I'll be more honest because I like the idea.
I'm sure you would but you ran out of time, but i think audio would be a huge help also I'm not super sure what all my structures do and how to engage my foes. Additionally, i think making it all one level so everything is visible might be a good idea or at least for the first few levels if you planned on having a lot of levels. Easy small bite-sized tutorial levels to get introduced to mechanics would be good. especially for how long this level takes
I really like the art and placing tiles felt so snappy! :) rolling and getting new pieces also made me feel good. I liked this game a lot, fun idea and I'm really glad it was one of the few I got to see. you should be proud!