Your core mechanic have a really fun concept and despite the game being so small it holds up very well, also the music is nice to listen to. There are a few things that could see some improvements:
1. The battery/health shouldn't flip with the character when changing direction, it makes it harder to read. Adding a color to the bars/circles would also be nice. 2. You should try to include a way of turning off the audio, no matter how good it sounds (it does sound good). 3. When using art from several sources you should keep an eye out for inconsistent art styles and "mixels" (using art with different pixel resolutions), you can also use a pixel art program to downscale art that have too high resolution for the rest of the game. The impact/explosion art you are using not only have a different resolution and style but also use a different color palette than the rest. Resolving this would make the game feel more cohesive. Overall I ranked the game pretty high due to how well put together the gameplay and audio was! Too bad I don't have anyone to play with :)