Hey I love this idea! We had something similar in the stretch goals but never got to that point. The only visual cue was that on the final level the exit chute was bigger and glowing. I think for a punishing game like this it's important that the players know where they're up to so will definitely take that feedback on board and try to implement it into the next one.
We also spoke a lot about the controls, the set rotations is another really interesting idea and would have made the game much more 'puzzle' rather than more action based; would have been really fun to test a bit more to find the optimum experience.
Thanks so much for playing and for your feedback.