I really enjoy the game but there's a few aspects I feel don't actually add to the experience. The inventory cap just means you have to grind extra gold every now and again, and the fact you have to keep items on to raise a skill just means you put them on, level up, then take them off.
It would be nice if it informed us what kind of increase buying set amounts of various upgrades would give. (such as the Bat, Nightbug, and Mutation upgrades for example)
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Hoping to add an undo button soon, which isn't quite the same but still lets you preview what you're getting.