You mixed Metroid with Minit? Well, I must say, I like the idea!
The controls are a little weird, and I think the mapping in your description doesn't fit with the actual game (took me a while to find out Z was for restart). I like the potential idea of the game, but I think right now the level design is lacking a little bit. Maybe having more branching paths early and some items that needs to be brought from one place to the other like in Minit would be interesting.
All in all, good game! I enjoyed the idea a lot!