Thanks for your feedback! Sorry about the late reply, we have spent a lot effort on the next update.
Storage management is still in developent, we admit it needs alot more work to be fully functional. Crafting menu had been polished and will be add in the next update.
To build a second floor, you can check the Q&A page:
"
Q: How to build rafts above the ground floor?
A: First of all, you should build a stair. Then, you can press number 2 on the keyboard to focus on second floor, and placed a land blueprint near the stair.
"
link:https://itch.io/t/137273/faq
Others problems like can't destroy buildings sound like bugs, we'll try to fix them in following updates.