What are some alternatives?
When comparing HearSeeParty and Retrospecs, you can also consider the following products
Glitchatron - Destroy your favorite photos
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
Photomosh - Turn anything into a vaporwave
Pixel Art Studio - A purpose-built drawing tool for pixel artists
MVGEN - Make your own music videos with audio, gifs, and special effects
Responsive Pixel Art - It's exactly that... responsive pixel art 🙃