Brilliant 5/5
Short enough for a game jam and enough challenge to keep me trying again after dying.
Only two criticism I had:
1. It wasn't entirely clear that the game wasn't over and that you had to mess around with the toggles. I wasn't sure if you just had to toggle things around a certain time or if there was a specific combination.
2. The boss could be beaten without moving. I very quickly found a spot that dodged the bullets but still could shoot it. Variety in the bullet pattern would have made it more challenging.