Thanks for reporting!
I've just uploaded a fix. It seems to be some breaking change in the audio API. I haven't had the chance to review the latest API changes in detail, so please let me know if there are any further issues!
Thanks for taking the time to share your feedback!
The sound effects are based on the original game, which understandably is limited given the Arduboy hardware. There's also a chance I messed up the port since I never heard the original SFX, only inferred it based on the code. I agree the blaster sounds are annoying: 0.5 seconds is way too long, and the Doppler effect doesn't help. Let me see how I can tweak it and better use Playdate's extensive sound SDK.
Saving settings... oops. I had that on my to-do list and forgot about it :)