Very interesting (and unique!) game. The contrast between the peaceful music and the boss fight is hilarious, and I do have to say - the pufferfish art is 👌. Some of the other art could use some improvement, though, as I felt the sky, ground, and other aspects were lacking a bit of detail/personality. The boss being immortal was very tricky, so great job on the April Fool's Theme implementation. That being said, I never really felt that I was in a rush, or that the time aspect played a bigger part into the game mechanics, perhaps try to integrate that more deeply next time?
Overall, nice job! This game had a lot of humor and personality and I enjoyed playing it :D