Thanks for giving it a shot!
I kinda wanted to limit myself to a single color palette for all the game, just for fun, and I think I managed to create all the sprites using only 5 colors. In fact, I also used the same palette to create the cover art for the game.
The game indeed needs to make more checks regarding the random elements, because yes, it could make you go through 3 gun rooms in a row, or 5 upgrade rooms. I also read a lot of people complaining the forced weapon choice.
I will update the game once the voting period is over, and one of the things I'll definitely add is the option to keep the current gun for 1 key. I think that'll add more choices to the player, keep the gun and lower my health? or pick a new one?
Im very happy you had fun with the game! Expect some updates in the future!