Hey I played your game and it is working well, here is my feedback...
- great to see there is a tutorial
- nice main menu
- good art style
- player could move around a bit faster with smaller collision so is possible to dodge
- nice upgrade system, i like how there are multiple ship types.
- i did not realize the coins were good at first, i thought they were bullets. try to differentiate them more
- i like the count down to start a wave
- it would be cool to see more varied bullet patterns
- good music and sound effects