It's a really neat concept but definitely too deep for me. I bounced off of it pretty quick. I like tower defense games as a time waster and this needed too much thinking :) I expected to like it because I managed to make it through most of Factorio and Shapez (haven't tried Shapez 2 yet). If you like tower defense games you should give this a try because it definitely offers something others don't!
shapez 2 is awesome! Definitely give it a shot if you liked the first.