It's a bit annoying I can close a menu just with the button I opened with. That would be great if I close any menu with the escape button. It's that way in almost any game.
The mouse cursor is a little laggy or slow when I open the crafting, furnace or cooking menu. Maybe it's just my PC but the game run fine.
Also it will be useful if can move items from and to inventories with a shift+click combo. I can grab an item with a right click but I cannot put in a slot. if I press lmb or rmb on an empty slot the item just stays in the original slot.
Can you split item stacks? Or can I pick just one item out of a stack? If not that would be a good idea I think.
The movement don't feel very realistic. Your character just "slides". Maybe you can add a slight up and down movement to feel like the character walks.
Can you add an indicator to the jetpack how many energy left?
It has potential in this game. It's a good game and a good start.