I absolutely loved this game :D Right amount of humour and the artwork is neat. Few things though, there should be like a cooldown mechanic on the powerup, since I could kill everyone by spamming Z right after hitting someone. The boss was a bit harder at first, but pretty much Z spamming worked on him as well.
This game could be even longer and potential to be a fun little adventure game where you would get xp and learn new skills and meet different enemies/etc.
As other people are saying, text was a bit long, but in my mind they were still well done so were interesting to read, although after losing to the boss and having the text again was a bit annoying, but obviously spamming space worked on that :D