I have checked the source, and man the other levels are nightmares. Did you really finished the game your self. I only finished the last one (Level 5) it was easy. You should make the levels easier, and for the spikes you shoul make there hit box smaller because I die without touching them (The sprites)
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I would say rebuild the game mechanics or redesign the levels.
But you could just make the hit boxes of the characters and spikes smaller, it will make the game looks not really good sense a part of the player enter the walls but it will make the player feel more free, rather that been punished for every mistake. I did it for my game and it stops it from being a nightmare since the throw controller is bad.