I'm sorry for not seeing this, I was kind of in the middle of a gamejam (I still am a little bit busy on the post-jam).
First on the outside: I think its not really necesary to put the arrows on the doors. To be honest I would still try to enter the doors without arrows anyway so maybe you can add a little text when you try to enter a closed building. It can be a good chance to add a dumb joke or something (I love dumb jokes). But yeah its pretty obvious what buildings you can go in, but i would still click on the other ones.
Inside: on the first screenshot its pretty obvious (much more than the second one). Maybe it is because of the shadow or the different color on the floor. But still I dont think anyone would have any problem with finding the way out on the second one either. I mean there is nowhere else to go, so going to the bottom part to exit will always be the norm in my opinion.
I hope that was helpfull!
Edit: I also don't have any problem with the bomb store being out of place. Especially if there will be more stores like that in other maps, I think its important to notice them right away.