Elegant game, and very well polished!
After completing one puzzle it told me “Nice, but look for a different solution”. I assume that happens when a given puzzle has more than one solution, but why not accept either?
Thank you for your feedback! It's too late to submit an update, but I did recenetly make a change in the code to accept any soultion. You can play an updated version at https://trillium.bmgomg.com/.