I'm really astonished you put this together in the jam, it feels like a whole game. Really impressive. I did find the difficulty very high, and I kept fumbling around. Sooo many times I hit R to 'reload' or pick up a gun and just restarted the level instead T_T. Personally I'd like if the enemies were a little less bullet spongey, since you're juggling so many different things at once in this. But that's a nitpick really, this is a great action game.
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Yeah I actually added an option to switch R for G in the pause menu. The difficulty I tried to address at least partially but the game gets much easier when you play more aggressively, by sticking close to enemies, but that's a bit counter intuitive if you don't actively get into that mindset. So definitely could have added a bit more pointers appart from the already present design choices like instant pickups at close range and the option to kick enemies.