I liked the game. The battle system got repetitive really fast for me. I'm not sure I liked having the super jump but not being able to control the height of my jumps. There was also a bit of precision platforming in there that was frustrating to me because the controls were so ridged.
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I don't want to come across as cranky. I did like the NES feel of everything. The graphics were fun, and this is a fantastic piece of work! I didn't come across any bugs to speak of.
I think that the battle system would have been more obvious that you were aiming if it had moved side to side rather than scaling up and down. My first thought was it didn't matter, then I lost to the first enemy. Then my second thought was bigger was better after the guy said to aim. After I got that there wasn't much challenge to it, just an extra step in the battle system if I wanted to crit.
Taking that battle system where the sight moves around and then having key spots on enemies that take more damage would be much more interesting to me. And I'm sure that is the direction you were heading with this.