Thank you so much! I'm glad you enjoyed it.
The drawing/erasing effect is just layers of sprites drawn with a gradient brush in GIMP (so it goes from light to dark) and then a shader that checks if the value for that pixel is less than X, and then a script that tweens X from 0 to 1.
I wish I had put more time into explaining how the game worked with in game hints, but I ran out of time at the end unfortunately :P
You are right, I was planning to have an event or a menu or something where you could destroy items, or a way to discard them from your hand without playing them so you can draw more.
Moving items was actually a design problem that I couldn't think of an elegant solution to, but I might actually use your idea of moving at the cost of stamina.
I really appreciate you taking the time and giving me really helpful feedback. Thank you :)