An interesting submission, both visually and through gameplay. I like the choice to make the whole thing being set on a stage, fairly unique premise to which to build off. Characters are decently animated and the change from left and right to forward and back is also a unique twist on the genre, well done.
Player feedback is very helpful and I feel like your game is lacking some parts here and there that could go a long way to improving experience. The small coloured circles work for the most part but perhaps there are better options that you could have used instead, perhaps a red flash on the character. Think of games like Minecraft when you hit enemies. In addition, being unable to dodge attacks whilst dealing your own can make the experience a little frustrating at times.
Overall, this is a twist on the beat-em-up genre and that with some polish, expansion, and a lick of paint, this would be something that I could confidently see on a marketplace of sorts. Good work.