Really fun concept! Reminded me of time-traveling in A Link to the Past :). Appreciated that the levels weren't too punishing and relatively short, so not too much backtracking on a loss.
The performance was oddly choppy for me with a lot of dropped frames. Tried several browsers to no avail, and I'm on a pretty decent computer.
I agree with another commenter that the screen shake felt a bit much. An option to disable it would have been nice!
Great work and I hope you all are proud!