Thank you for the feedback! Yeah, blaster might be a bit OP :) I'll fiddle with weapon values and upgrade costs until it feels right. Honestly thought it wasn't an instant upgrade if you leveled up the plasma beam somewhat before unlocking it. Did you upgrade beam damage or caliber? The former does little against rock asteroids without the latter, I need to communicate that better.
As for the tutorial breaking, did the first asteroid never spawn for you? If you kept moving, you might've missed it, I'll alter the spawn logic to avoid that, but if the Wave 0 never began, that's a headscratcher.
As far as completeness goes, it's honestly hard to say. I still have half a dozen features I'd like to add, plus a proper endgame/bossfight, but part of me wants to call this project a done deal, it was never meant to be a big game anyway. I'll address all the feedback I've gathered for now, and try to gather some more to see if this game is worth developing further.