I like the feel of the game. I am not too sure about the shield being the down on the d-pad but after playing to the end. I got around that and used to it.
I love the SFX and the music takes off after the initial beginning of the piece. Great job with the channel mutes between the music and sound design!
I liked how the screen shows more of the level once the character jumps on the ledge. Normally you can hold Select plus up for that but I appreciate alleviating the player to do extra controls.
The level design and enemy types were awesome! So well thought out. I think I was spazzing but some mouse enemies ran faster at you which I liked.
This is looked, felt, and sounded like a an Official GameBoy title. Awesome work! Can't wait to see more.