That's really cute, even if very simple. I do really like the artstyle tbh. The music is pretty good too, despite being brought from another project. Gameplay itself is also fun, altought kinda basic, I have to admit. The little story did hook me tho, I always appreciate those.
For critiscism I think my main thing to say is that the timer at the bottom eats up a little too much of the screen, it actually ends up hiding the player char a lot of times, I think it would have been a better fit to place it on either the corner below hp or the one below the score. Hitboxes are also a little too big, so the exploding enemies felt a little overwhelming to dodge, but they're really the only offenders of this, other than their bullet pattern in specific the hitboxes feel alright most of the times.
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Yeaah, i noticed the timer thing too but i was too busy finishing the boss and fixing bugs. Though im not sure if i would put it below the score/health, maybe i could make it smaller and only show the text.
About the problem with the exploding ships, i could try to make it have a better difficulty curve by making it so the waves get harder the closer to the boss you are and make the bullet hitbox smaller.
Anyways, thanks a bunch for the feedback!