The changes:

- Level UI has been completely reworked to make it prettier, easier to understand and easier to use
- Some UI elements are world space now
- Lots of tooltips has been added, so it's visible now what this or that button do
- Wave counter and wave information has been added, now you can see what monsters will attack you and what characteristics they have
- Elf builder balance has been changed: Wyvern price has been reduced a little

Once again thanks everybody for the feedback. It helps a lot to improve the game.