I was lucky that I got the shield very early. I think it's a really powerful item.
Level 7 had some interesting new enemies too.
One level (12 I think) I was sneaking past everyone with the cloak, only to be detected a few steps before the exit by a surprise attack (not wanting to spoil too much here). Next level I got only to the second room before being decloaked and suddenly I found myself in a perilous situation very quickly after two or three encounters decimated my health to the last bit (nice that there is some extra music for that), and before I could fully heal I got struck again to the last bit.
Eventually (some levels further) I got hit by one too many enemies before reaching the next room with health to collect.
As I had mentioned on Discord already, one major issue I see is that for some dialogue popups you do need to grab the mouse to click to confirm them. Like the first encounter when your cloak loses its effect.
Also, being able to move with the cursor keys as well would be nice.
And maybe some more (hidden) win conditions, for example when you collected more than 1000 coins?