Delighted to hear back and that you are enjoying the game!
Addressing the bugs, I had known that a few ? rooms would boot you out due to the ground level being too low and fixed the ones I knew of, do you consistently notice specific ones doing it consistently? Otherwise it could be a programming error as opposed to design.
I definitely know what you mean about the solitaire effect, being out of bounds in a Source Engine game is essentially the same cause and effect. I've seen it happen but thought I fixed it, though it is hard to track down due to appearing seemingly at random.
I'll try my hand at hammering those out properly soon, as for the unbreakable blocks problem that might be remedied with some new items and systems I have planned, though a safeguard pass in the generation is probably warranted.
Thank you for playing and for posting,
Plub