Good job with your game. It was fun, but yeah, it glitched out on me in the middle of each playthrough. I do like how you incorporated the Tiny World theme through the narrowing of the game. Keep up the good work!
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I think the first time it happened, it was when I died. At first I thought it was intentional until the glitched sound wouldn't stop. Also I think the gameplay was frozen. I can't recall what button I pressed, but it went to the main menu and the sound went away.
The second time it happened, I definitely looked at the player health 'cuz I thought the error was due to the player death, but it said there was still 2 health points. I was just dodging some enemy bullets so maybe the interface hadn't updated the correct health yet or maybe I didn't die and the sound/freeze glitch is due to something else.
I hope that's helpful. If I had known you were interested in that level of feedback, I would've have taken a screenshot and paid more attention. Sorry.
Good luck trying to suss out the issue.