Nice game, played to Level 23 in one go for now, has some unique mechanics I haven't seen before, with the later levels really starting to utilize on it. Could use some more recognition :)
The UI feels mostly all right, though I miss being able to rotate elements placed with right-click only, removing elements could also be easier (would have expected dragging them off the grid to work). Swapping elements by dragging one atop another could also be nice (could be nice to quickly fix mixed order of fills). The base idea on how to interact with the game is solid, though!