The physics displayed and reactions are good, but as said previously, a pretty repetive game. Maybe if you add onto it, and different enemies, add power-ups etc., the game would be more entertaining. You show good skill, but little imagination.
I'll definitely consider expanding the gameplay later, but for now I'll hold off on flooding the game with bells and whistles. I wouldn't want to spoil what charm my game may have had by adding elements without thinking them through, you see.
It's one of my more prominent paranoia's.
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