Aseprite can be compiled yourself for free if you're comfortable doing that (I can post the link of the YouTube video that I used to help me do it). It's completely legal, the creator puts the uncompiled version on Git for people to do that. It's what I did to try it out to see if I would like using it before spending money on it.
We're still kind of working on the platformer, so there's still a small chance that we will end up submitting it. It's meant to be a puzzle platformer very loosely based on Greek mythology, where the player plays as the goddess Nyx and she must carry tiny worlds up a mountain for Gaia so they can be put into the sky and added to the solar system. Almost all of the art is done, and the animations, the basic controls, start screen and options menu, but we just can't find a way to make the puzzles interesting or engaging. I think that despite the two of us loving puzzle games, neither of us is smart enough to actually make one, lol!