I get an application load error, first time i've ever seen that on here. Anyone else/any ideas?

Hello! Your game does not support windowed mode. Can you please add ability to switch to windowed mode? It is very important to me.

Only sounds, but no music. Why?

Am I missing a joke or something? Why is the game name ending in a IV (4) when there doesn't seem to be a 1-3? Pretty sure this is just a reference to something that isn't obvious to me. Can somebody enlighten me?

There are 2 little things that I think would help a lot. One is to be able to leave a run in the middle and continue it later. And the other is the grinde, after several runs I still don't have enough materials for a single upgrade. It's a nice game, I like it, I think some small changes and above all a little more enjoyable progression is all it needs. ...