Introdicing mana limit and level #3

In case someone would use telekinesis too much, now it costs mana. Actually, it's pretty reasonable. As you play as a mage, this mage has a limited mana pool. So launching fireballs costs one mana point per ball and using TK to push or pull fireball in flight costs 0.1 points per second.

But that's not all. You also use mana to maintain a magical lightning shield. And on the third level, there are archers shooting at you. So either dodge the arrows or each shot will cost you 0.1 mana. Not much, but each portion is one second of TK use.

Also, you can gather additional mana from the barriers (aka bricks) that you haven't destroyed after finishing the level. Neat, right?

Seriously, what do you think? Are all those features cool, or am I just complicating things? Or maybe the whole idea of "archmage breakout" is not very appealing and I should try something different? I would really like some feedback about the game at this point.