Thank you! Rushing the chests is indeed one of the best strategies. Personally I try to kill all the enemies first, but then I have to rely on luck to not break my right and pickup key, so that's not really a good strategy. The boss needed some refinement I think, but I'm glad you liked it!
The second part is definitely true. At first I wanted to make the exit at a random side, but I didn't have time for that. I also wanted to add some random pre-made room structures, but I thought that that would take too long, so I just randomly placed some rocks instead :).
Thanks for playing! (And actually playing long enough to find all the content!)