Stupid game, the first boss is almost impossible, the laser phase is so annoying, the boss also deals so much damage and there are close to 0 way to get more bits.
This is a demo, that's the last boss - that's why I was fine with it being so OP. If you didn't beat it, that's okay, you missed almost no content, except for all the hidden chests with bits, of course :p
ZetaGal (the full game) will have an easy mode for people who want a slightly more laid back experience.