Like other comments here, I agree a map would be really useful. More varied terrain could help with navigation too.
The game is great overall! Love the glow effect and little particle explosions, they add a lot of fun to the game. Super polished for a game jam :)
I think it would be nice if in addition to different guns opening different doors, there would be puzzles that encourage using the different guns in unique ways. Something to make the player feel smart when they solve it.