Amazing. Don't know if you've played the game Lemmings but your game reminds me of it in some ways. Last few levels had a nice difficulty level.
Something that bugged me was when trying to redo a level that required a very specific placement of food I had to redo it a couple of times if I didn't get it lined up just right. One way I could see this being fixed is an indication of where a food item was when it was eaten on the previous run. (Like just a little half transparent burger/bean/etc. at the exact grid spot). That way I could redo what I did last time quickly while being able to adjust slightly as needed.
I found that some levels could be completed using less guys/food than it gave me, so something that could encourage replaying levels would be to have statistics, for example, how many guys ended up being used or how many food items were left over. Maybe assign point values to each to aim for a high-score.
Very well done I had a lot of fun!