@shru - yeah drops are completely random. basically there's a countdown going on with different chances of drops spawning, with batteries being the most common. dry spells are something i've noticed myself, but having it be more dynamic is honestly pretty brilliant and something i'll definitely try to implement.
re: highscores, i've actually already implemented that in a post-jam version, persistent savefile on your hdd and all! it's on the itch page, although i'm hiding the downloads until the end of voting, just to be safe noone accidentally rates the game based on the edited version.