Ooh, this has some nice old-school kind of vibes. I dig the simple art; it sort of adds to that vibe. And I love the little world and character you've built as well.
I was a bit confused about some of it mechanically, like how exactly crafting fit into the loop (it never seemed particularly useful to me, but maybe I was missing something?), and why exactly the wrench needed to be charged in order to be thrown, but didn't seem to come out at all if it wasn't fully charged.
I was also confused about how some of the enemy bullets worked. On the second screen, there were arrows just flying in an impenetrable line across the screen, and I wasn't sure if that was intentional or not.
All that said, however, the game is just simply fun. It's just enough to make me feel cool when I dodge some bullets and throw the wrench for a final hit on an enemy. With some more polish, this could be a very effective like game!