This was really cool! I only wish it was longer!
The idea / concept is really cool, and really gives you the option to play around and create many interesting puzzle designs. It's simple and effective! The art is really cute and I think it fits the theme well. Some music or SFX could be nice too. I am amazed by the fact that you made this in HTML and typescript, it's fun to see someone use something else entirely apart from a game engine! It gives way to different takes and design choices which is awesome.
Congrats!