Very cool idea, fast forward and some indicator of what a tower would cost before researching would be nice. Maybe a feature to queue what your next tower or action would be since building, recycling, and researching takes time.
Good art style, I can see that even the shadows casted as custom.
You either get the game and make so much money that you can't spend it fast enough or you don't get it and lose pretty quickly. Crafting and resources are a bit unnecessary, they're only a pain early game when you want to focus on one unit.
Very good Tower Defense, my favorite game from the itchio game jam for now. If I can give some feedback the blueprint system is cool but not super smooth, maybe a basic upgrade system where you can compare the before and after stat would be better for a smoother gameplay, but other than that 10/10.