When at a forge, you can go left and right to move between forging and building. Even if you leave you can still go back using the edit island.
That bug is a pretty major bug that I found minutes after release. I have issued another update(v1.14) just a couple minutes ago that directly adresses this gane breaking issue.
Yes, the tutorial needs to be updated to include tech and the new forging system.
Floatrons will always be sold at the shop. So will weapons.
Multiplayer would be awesome, but if it happens it will be in the far future.
Thanks for all that feedback. Its really helpful.