This is super cool!
The game is excellent and mimics old arcade games quite brillantly. One strong, original, simple mechanics, yet demanding gameplay with very different levels with cool fly patterns and where the solution is generally a nice pattern too. The difficulty is pretty on point.
And there are quite a lot of levels (I explored up to level 13 only by exploiting getting extra lifes by spamming X), it feels like it could be a full arcade game just as is, I have not reached the end but it seems like it's a big game, and it'd definitely take me quite a lot of time to manage to reach the 10th level without cheating anyway.
I have ton of fun playing this, congratulations and thanks for sharing.