I managed to get the game running on MacOS by cloning the repo, checking out the last commit before the jam deadline, and unzipping one of the release zips inside to get the assets.
Is the assets repo private on purpose / are you not allowed to redistribute those?
I found it slightly difficult to click fast enough to shoot only 1-2 bullets at a time and not waste ammo, and the amount of enemies seemed pretty extreme. On some runs more than others, so maybe that's the spawning bug?
Also got hosed one run when bullets collided with ammo boxes which was unexpected.
And on my very first run my cursor got "lost" in the bright spot in the room and I became very confused.
Overall a nice looking and smooth game though!