Okay I pushed the update. There is now an updated and easier level 2 and level 3 has been completely redone and is now a boss fight. Do not question the boss AI, I don't understand why it violently spins either.
I made the camera now be slightly above the player, hopefully that improves some camera issues.
The music volume slider should now actually change music volume. You might have to restart the game for it to take effect though. I have not figured out why the game keeps crashing randomly. You will have to live with it I guess.
And also I redid the thumbnail.