Why sound only in 3 levels? If it some bug you should fix this. Concept of old 8-bit games looking good, but needed in upgrade. And I found one bug with ceiling blood, it isn't kill sometimes.
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Are you referring to the boss level music? There's ambient background sound and SFX in all levels but there's only boss music on 1-3, 2-3, and 3-3. What do you mean by an "upgrade"? And the drops are a known issue. I just didn't have time to fix them. They kill from the sides but not the top. It's just a hitbox size issue.