Great game you have here. Having the main player character be limited in how many times they can attack, or use a special move, is a good concept. However, I do have a few small issues.
The first is that the attack key is left-click, instead of something on the keyboard like X or C. Also, I feel like losing a level once you run out of battery is kinda lame. Personally, I think it would have been better if the player could continue the level, but the enemies are more fierce, due to the fact that you can't attack them.
Other than that, this is a great game, I like that takes inspiration from older Mega Man games, and its nice that there are multiple weapons you can choose from, although personally, I would have added at least one more weapon.