This was really cool! I struggled a lot against the Hammer Bros, though. I think "Difficulty" would have made more sense if it was called something like "Ship Type". I didn't necessarily find "Easy" to be easier than "Standard", they just felt like two different play styles. The "Easy" ship seems like it has higher shielding but lower hull, whereas the "Standard" ship seems like it has no shields but high hull. Not sure if that makes any sense or not, but that is how I saw it. Awesome job on the jam!