I really enjoyed this one. It's super clean and polished, and it has a good amount of game juice to make collecting coins and bouncing off walls feel nice and punchy.
The design of the game is very elegant as well. The mechanics are simple and intuitive, and there's not much the player has to do to figure out exactly how they work. I like how some of the levels are designed to make the player use their tail as a tool to protect themselves from spikes. I also found it quite clever that the shadows, which seemed like just some visual flair at first, can actually be used to to figure out which objects are immediately accessible in a given turn.
I noticed that the dotted line used for aiming stops interacting with objects after being reflected or going through a teleporter; as in, they don't even detect coins or walls. This might be intentional though, maybe to prevent a halting problem with reflections, or maybe to make planning each dash not too easy. Not too sure, but I thought it was worth bringing up.
Either way, great work!