I'm really glad you enjoyed the game and the next update is gonna really be awesome.
- Backtracking is not something I had initially planned for (kind of like most rogue-likes where once you finish a level you just move on). I'm not to sure about implementing this, but I'm also not gonna dismiss it to soon. I will be having this in the back of my mind and thinking over it.
- Thanks for this bug report about the shield tech. I have heard some reports similar to this however the cause was unknown. It seems that I must have not added the tech back into your inventory. I would say that this is gonna be fixed in the next update, but the entire old tech system was removed, so I guess the problem is gonna go away.
- It was only a matter of time before someone found it. Yes, its a bug and I totally forgot about it (just recently rediscovered it while doing a close cleanup). It was just supposed to be a one off thing to make things easier to test.
- That is an interesting idea. The question mark choice can certainly be improved as well to not give you 2 of the same things in a row (especially the shop and forge).
Thanks for your feedback and support!