Hi there!
Last few days were very busy.  I decided to make quite a significant change in TBC. Up until now, there were two ways to cast a spell in the game. Random effect by catching a red or blue card. Or by grabbing a "Star", that will open a bonus window and let the player to buy one of 4 random spells. The problem was that red and blue cards are giving few random effects and "star" spawning chance was quite low. I had a feeling like the spell system is not really utilized properly, Too much randomness, and sometimes I could play for a while without seeing a spell at all. Not to mention that first comments received suggested that the game is too difficult. In general, lack of tools to heal or defend from enemies projectiles.

...so I scrapped this system almost entirely, and now I am working on a new one. I have borrowed the idea from survivors games, where you get an exp points for some actions or pick-ups and gain levels. On each level, a window is popping up, but in TBC it will be a window with spells. 

1. I can decide how fast a player can get level, which means how often spells will be cast. This is useful to make a difference between heroes. A witch might cast spells more regularly than a knight, for example.
2. There is a EXP bar on the right that will show progress of collecting experience (...or mana).
3. Every hit into box, gem chest or enemy etc. is giving exactly 1 point of EXP. It does not matter what kind of attack will hit, can be player ball, special attack or supporters attacks, or even a rocket. This is giving nice scaling for a late game, where it can be few supporters and some rockets flying, EXP bar will load much faster.
4. Every next "level" demands few points of exp more. The very late game will become harder, this will counterbalance the number of projectiles.
   
5. First 4 spells will be free of charge. Healing (+2), special weapon (+1), coins and gems. But I have reduced the strength of those spells because they are going to be cast more often now.
6. Other spell will have some price and will have to be unlocked by playing campaign. The further into the campaign the more spells in arsenal, there will be a Re-roll button as well (also paid), so that the player can hunt for his favourite spells.
7. Blue and red cards will remain, but the probability of their spawning will slightly reduce. They will provide random effect like it was before.
8. Extra "stat" Bonus system will have to go or be completely changed. I like the idea to have some strong pick-ups falling down so that player will have to make a choice to go for it or secure a ball. 

How does it affect gameplay?

• Now there is actually a room for some tactics because spells are cast more frequently and player can choose some of them. Supporters, rockets, or building defence line. This will have some synergy with heroes special skills.
• It is significantly easier since the player can heal and add special attacks more often. I will probably have to add some hit-points to enemies and maybe make their spells stronger.
• gameplay is faster, and more thing are happening, I think it is a good change.

Check out a Demo, it is more fun to play now.