I feel like the gameplay is definitely the most strong player in this game. It's got very interesting jump mechanic. The fact you can access fancier attack moves the longer you are in air is really cool. I really liked the save spot feature as well, helps a ton for those of us who are terrible platformers. I love that there are helpful text (even if some of the keyboard instruction isn't correct) everywhere I acquired a new ability or that I am about to run into danger. I thought the music was also very nicely done, it was simple but suits the game very well. Feels like I can really use a sound when enemies are getting hit, as well as maybe a visual hint(maybe they flashes red for a second to show they have taken damage).
I notice Anya can move quite a distance horizontally and I for some reason had trouble estimating where she would land sometimes. I am either pleasantly surprise how she was able to make a jump that I thought I for sure have missed or I overshot her and she cleared right past the platform that I thought she was going to be able to land. But this might have more to do with my poor platforming skill than the game. :p
Being a graphic person, I do wish Anya's sprite was done with a little more detail. But I understand since the artist was also the coder that it's difficult to do both job perfect for a complicated game like this in a month.
Overall I thought the game was very well designed, and really well done for a team of two. :D