Press flag. Click on blocks to use them and to change colors click the arrows at the bottom. ⚠️WARNING⚠️ There is no way to delete blocks, and there is no snap to grid so be carful placing them.
All code is by me I will make a version two that will have snap to grid, a delete block function and a cloud save system. Follow to get notified! (P.S. feel free to remix and make version two for me. It'll make my life easier)