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I had figured that the size of the planet's sprite in relation to nearby ones was a good way to tell its size, but then I ended up walking FOREVER...
Maybe consider changing it so that you can hold down S when approaching stairs to bypass them entirely, so that you wouldn't have to drop down...
Sure, you can just click the item and drag it out of the inventory window to use it, but it would be much more useful to simply press E or the...
I can't even tell you how many times I have selected the wrong one, especially when panicked. Maybe consider flipping one so they don't look so...