Sweet little game!
The biggest strengths I see here are:
Creative mechanic (actually ended up being pretty well balanced and thought out),
Pixel art (kudos for creating all of your assets by yourself)
Overall cohesion (for what it is, it actually feels like a unit of a game - with problems, but it works well)
The biggest weaknesses I found were:
Missing music (It would add so much atmosphere)
Huge hitboxes (It was a bit frustrating to get hit by enemies who were visually a distance from me)
Good job anyways and hope to see more games from you!