We made a hardcore scroll shooter. Would you mind giving us some feedback?

The player will fight against random bosses with increasing difficulty. Only 6 levels and 3 bosses each level. We wonder is the gameplay is too hard for higher level?

Sound, FX and Music credit to:
- Metaruka
- wobbleboxx.com
- Alexander Ehlers

Itunes: https://itunes.apple.com/us/app/fun-fly-1-ryzen-of-bad-kitten/id1317686610

Google Play: https://play.google.com/store/apps/details?id=com.fc.funFly1