This is really good!! You did a great job nailing the feel of an NES platformer, this definitely feels like something from that era. The controls are tight, the music and sound effects are great, and the graphics are really charming! I did find it to feel a little unfair at times, especially in the second level, where I couldn't actually progress because it didn't seem possible to get onto the platforms with the knife enemies on them without getting slashed on my way down, since they wait for you to approach before slashing, I feel like they might work better if they attacked on a timer instead of in response to the player, allowing the player to time their jumps so as to take them out without getting hit. Overall really great game! I don't know how many levels you made, but I'd love to see the rest of it beyond level 2 if things get updated! (or maybe I just need to git gud at hop hop...)