Pretty interesting idea, although it's pretty fundamentally flawed. If you play well enough then you'll never need to use the dual purpose thing. If you get hit and you lose the color of energy you need for the enemy, then you just have to run away to recharge it.
I almost feel like the different ideas, although individually not bad, just don't work well together in this case.
Another practical problem is that the game is way too small, I have a 4K monitor and I have to squint really hard to see the game, especially because everything is all black.