Congrats on your entry!
So I wasn't immediately sure what to do. But I started clicking around and it sort of made sense? But my favorite moment was trying to completely surround the chest and seeing your wall placement system come to life. That immediately struck me as a really cool thing that also could have been super time consuming to create, especially in such a short jam. But dang is it cool. Nicely done.
Ultimately, the controls just feel a little awkward. The topdown style and tile placement make me want more broad RTS controls with faster movement or moving the camera by pushing the edges of the screen with the mouse. And I can see why you made the "player" delete tiles. It might be too easy to create something where you can easily trap a hero in a back and forth loop. But the solution feels a bit too clunky to be fun.
Still, this has a lot of potential to be a cool thing. I haven't seen something quite like this - the active building elements especially. Bring back the RTS!
Good job finishing your game in 48 hours. Keep making games!