Thank you so much for playing, and for the amazing feedback! It is very appreciated!
I will work on making items more visible for the next update!
Backtracking is actually a pretty good idea! There are vaults that requires keys to open, so if you get a key later on you can backtrack to the vault you found and open it. But that about the most backtracking there is in the game for now. At this moment I will focus on finishing the game, but once the base game is completely finished, I am pretty tempted to make more interesting backtracking!
I think its a pretty good idea to keep to a minimum variety of spells the first couple of levels to not overwhelm the player, so I will definitely look into that!
Thanks again for the awesome feedback!