Love this game. Interesting puzzles, simple and clear art, and nice music. There are a couple tweaks that I think could make it even better though:
1. There's no way to pause while playing. When the robot is talking you can press enter or P to pause, but in game that action gets replaced by another, switching the tile you're placing. I think you should maintain the pause ability and move tile-switching somewhere else.
2. It's a bit hard to see some changes you have to make. There comes a point where the changes are very minute, and the parts move so fast, and the changes are so small, it becomes a bit frustrating. It would be nice if there was a way to scale it up, or slow the speed. Would be helpful for people who have visual disabilities too.
3. Tile switching can be easier using the mouse scroll. Mouse controls make this game so much smoother, but you still need to keyboard to change tiles. Would be great to be able to use the mouse scroll action to switch between tiles.
Aside from that, the sound of the robot is a bit grating, and there some momentary glitches where tiles appear where they shouldn't. This is all just constructive feedback though, overall I really enjoyed this game.