I actually love this game despite how difficult the first level is for me, anyway. This game feels like an action platformer puzzle where I have to jump on or teleport to another platform and avoid bubbles trying to catch you and cut you to pieces. My problems are that I don't hear any music, but the audio sound effects fit the game's overall theme really well. There's also no restart logic whenever I get caught by the bubbles. These problems haven't stopped me from giving it a 4 stars in terms of gameplay and graphics. I only gave 3 stars for audio simply because I don't know if music is playing in the background or it was never implemented. As for the NES feel, I gave it a good 5 stars because the sound effects and gameplay definitely have an NES feel to it. Nice job overall!

I reached the exit.

The game was longer than I expected and it's full of very cool and different sequences whose length and difficulty are perfect. While unique enough the game also completely feels like a NES game and the ending screen and music are cool.

To be fair I never completely got the jump command, basically I often pressed it thinking I would jump but didn't, yet that was no big deal in the end and I had a lot of fun playing the game anyway.