I think I know where you mean.
But can you post a screenshot of the place in the room so I can make sure?
You may be able to edit the image out of your post after I've replied again to prevent spoilers I guess.
Viewing post in Devlog - 33 [DEMO UPDATE] comments
Okay yes, it's the place I thought it was.
So, the issue here is, that room should not be accessible in the demo so I did not include that room file therefore causing the game to try and load a non existing room resulting in that black screen loop.
I'm guessing you managed to hit the block through the wall thanks to me not having fixed that issue yet.
I'm going to have to rework projectiles a bit at some point in order to remove this issue where they can go like 1 tile inside walls or so and therefore hit stuff behind walls.
Bottom line, that room is not accessible in the demo.
Thanks for telling me though because now I know this issue exists there as well. :)
(feel free to remove the screenshot to reduce spoilers, if possible)