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i agree (i am making my own limitations by using the screen size for the NES as well as every colour and style limitation (i.e. no parallax))

I limited to same screen size as well.  I don't remember if there were button constraints but I also limited myself that way.  Plan to add controller support post-jam.  

I also limited myself by only using one synth engine and 3 waveforms for all of the sound.