I felt a massive amount of kirby inspiration in this game. Art, enemy design, level layouts. Everything oozes GB/NES feel. A very well designed game. Only piece that I don't think fit very well was the little "X" girder blocks. I'm assuming those made it in late in the process to help guide the player to stuff that is off-screen?
No real critique other than it was a little too easy up until the cool platforming bits at the very end -- but it's not a real critique. I'd rather jam games err on the side of being too easy than too hard. Definitely get more people to finish that way as it seems like most quit as soon as they die.
Great work on this!