After 55 hours, I've had some thoughts.
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A big one is that when I choose a tool to use, I often tend to hold the button which causes the UI menu for selecting a tool to flash rather than just stay open. Simple solution is to have the button to take a single input to bring it up and have it require the button to release before a second press closes it. Another, have it stay open while the button is pressed and then have it close when you release it. Third option is to change it to a radial menu, which would feel more comfortable to me.
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Opening my inventory seems to cause some lag, freezing the game a brief moment. I'm not sure the cause of it but it would quite likely be the cause of checking a database EVERY TIME the menu is opened. This has to be fixed for the game to play nicely since you need to access your inventory quite regularly.