Great idea and visuals!
Could have used more testing and polishing though. Displaying how many minions you have of each would be very helpful. I quickly had only one red minion which made nearly every puzzle impossible and I guess I would have had to restart the whole game. Sometimes blocks got weirdly stuck, like I had two blue minions trying to push a blue block into a hole in a blue path but they just got stuck with the block half in the hole and the minions pushing it against the side of the hole preventing it from falling down further.
Often I didn't really know what I was supposed to do. Maybe try to keep an equal balance of the minion number and balance how many and which I sacrifice. I had a lot of yellow minions when I gave up and only two blue and one red so maybe I messed up somewhere early. This is a bit like a strategy game where an early decision or mistake can give you huge trouble much later and fixing it would require loading a savegame from many hours ago and replaying half the playthrough...
With this "sacrificing them equally" idea and a counter per kind it would be interesting to try again. Just like learning something new in a strategy game and applying it in the next playthrough or next set up of whatever.