Hi Vlosyros,
Thanks a lot for the feedback!
1. It's weird because there should be a white border animation showing currently selected UI element.
2. Basic Spell is like that because he is used mainly for regenerating mana. The thing is that before his base damage was 2x higher and it was already enough to not feel the need of casting the special spells that you're creating, especially with few Perks boosting it. Balancing it is a problematic stuff. However in the main game it will be possible to boost base damage of the Basic Spell in the meta progression.
3. Hmm, maybe because there is so little content available? Like only 1 level which you can finish pretty quickly. Also enemies on level 1 are really weak too because I didn't want players to hit the wall with too strong normal enemies right at the beginning of the game :D