I like the challenging aspect of the game, though I'm not sure about the difficulty coming mainly from the spike hitbox range. I also didn’t hear any sounds during my playthrough. I did beat the game, but I got this error at the end:
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ERROR in action number 1
of Step Event0 for object theball:
Moving to next room after the last room.
at gml_Object_theball_Step_0
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gml_Object_theball_Step_0 (line -1)