I tried playing both versions, both we're flagged as virus after some wrestling with it i managed to get it working:
-I don't understand how gun combining works, or it didn't work? I tried to combine the weapons but nothing was happening
-Enemies ignore Immunity frames, also when you kill someone their hitbox still lingers for like second or two.
- I managed to glitch through the walls by using dash when bullet hit me, I gained a ton of momentum and glitched through wall and locked door.
-No idea what to do with the doors? There hasn't been any keys or anything.
Overall pretty fun concept, if the gun combining would work. I feel like the concept is good to work through after the jam. Cheers