I really enjoyed the retro feel of your game! Here are some tips for making it even better:
- Music's good, but at times it gets a bit buzzy, crunchy to the ears... perhaps if you soften the tunes a bit, remove some of the noise, it'll sound more pleasant
- Felix' house seems so bare! Perhaps some simple furniture, like a bed, lampshade, and simple deco like a rug, a mat, might give it a cozier feel!
- I ran into two bugs (one of which made me stuck by the time I write this review); some times the movement locks up at a direction (right), I noticed it happens some times after pressing Z; the other bug is in the computer lab game, when the character jumps over the gap - I need to jump and press right at the right screen border for getting to the next screen. I got stuck there, because after jumping the second gap the character just vanishes to the far right side of the screen.
That's a promising project, some more polishing and I'm sure it'll score neatly! Keep safe and godspeed :)