I really love this concept. I had a lot of fun playing, although it took me some time to understand how to use the sword properly. I did not notice the arrow on the sword at first that you need to spam A or D to build power for a hit and switch weapons to shoot. Once I figured it out, it felt perfect!
I ended up getting captured by too many enemies, dang it! However, I think the game would benefit from a short tutorial at the beginning. The controls also feel a little awkward, I would suggest holding A or D instead of spamming to build or drain power.
So, I really LOVE this game! Great job! :D