I liked this one! Nice job with the difficulty. The mechanic works pretty well, and what it encourages is interesting: I realized that I needed to use enemy hordes to get magic more so than the light beams. At one point I was being mobbed by tons of enemies and was able to fight them all off because they kept giving me magic back.
The magic shots drove me a little crazy because they were both slow and didn't move with my momentum; I tried several times to shoot just before I ran into an enemy, but it was useless. It took the pace of the game down a notch, but that really just makes it different. I had to play at a more deliberate pace.
There were some odd performance issues - I blame Unity - but overall, this was fun to play!