I enjoyed the old graphics, some of the mechanics weren't as enjoyable and some polishing would definitely make it better, but great submission nonetheless.
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I didn't like the jump mechanic, I just felt you need to get the timing perfect or else you will fall and sometimes it became really frustrating dropping from high points. I also felt as though the enemies weren't a challenge at all and got no satisfaction from killing them, I could just run past them and ignore. The boss fight was also very stale and repetitive. Again, this is just my opinion, I hope it doesn't come across as me slandering your game, I think the game is still amazing and very well made with a lot of effort. Just some of my the things I disliked, just my opinion though.
The Jumping mechanics is what most of our users have complained about. We are working to fix that issue. The enemies work slight differently as in when their health is less they attack faster. The Boss Fight is something that is still under development.
No worries all opinions are welcomed and as developers we really appreciate all kinds of feedback.