Very fun little game! I liked that it was possible to make the items before you had the blueprints for them, and the whole crafting thing felt really nice. The platforming sections to get the weapon upgrades were fun, though not too tricky. The ending could have used a bit more zing, though. Maybe a little credits sequence showing off the new shop or something.
Is there any use for the coal you get at the beginning? And is the item to the right of the bomb in the menu always blank or did I miss something? I'm pretty sure I got 100% otherwise.