If you don't want to spend the jam drawing buttons, here's a free cozy UI kit:

• buttons in 4 states, panels, a dialogue bubble, toggle, slider, progress bar, tabs and 12 icons as 9-slice PNGs for any engine (the borders are listed in a json for Unity/GameMaker)
• a ready-made Godot 4 theme
• 15 matching UI sounds (WAV + OGG)

Free, commercial use OK, credit appreciated: https://ahustga.itch.io/cozy-jam-kit

Have fun building!