From the text in the tutorial I thought the gameplay was gonna be hard to grasp but it's surprisingly intuitive to understand!
Lost on my first try, had some tough luck unlocking my final upgrade for the second, but managed to win! Really fun game!
I loved the design choice of having the robots just be the components floating around, the animations were very lively and made it work really well.
The menu for buying/building the robot is also very compact and easy to follow! I have only one real criticism, which is the fact that you couldn't swap components in by just clicking "equip" and had to sell/unequip the one equipped first, which was disconcerting at first, but it didn't really detract from the experience. Also (I just remembered this and came back to edit) it wasn't clear whether you could upgrade one component more than once, I tried doing it in my first play through, and an "upgrade" sequence happened but I don't think it changed anything.
All around I really enjoyed it!