Nice game for the jam and well done for tackling it all by yourself! The visuals are really good and the puzzles for each level are well designed. Music/sounds would have made a big difference from an enjoyment point of view and I'm unsure on how I feel about the 'things' wandering around after you place them, I think it's an interesting idea but maybe could be implemented slightly differently as it feels more like a nuisance than a challenge, although I do like them wandering around before initially being placed as it makes them feel alive :)
Very nice puzzle game though and good implementation, nice work :D