I really like the artistic choice in your games, so much retro-like.
The sprites could be improved adding animation, it could be really nice to see that in your games, but well, we're talking about games done fast, so its ok, I guess xD.
Hard mode was not that much impossible, I could even dare to say it needs to be harder.
The hitbox did its job and nitori lived, but wave attack felt kinda useless, it doesn't feel like doing that much damage to anything xD.
Still, very good shooter and a great tribute, the music goes very well with it and it feel kinda fair.