Thanks a lot for getting interested in Pixel Art Studio :) Unfortunately that is not possible, and I don't intend for a free version in the near feature (the whole pixel art core would have to ship with a free version).
In any case, the add-on is out for just 3 or 4 days and there have been more than 7 updates, with dozens of improvements and also new features: https://alfredbaudisch.itch.io/pixel-art-studio/devlog
Plus it has basically just 2 known bugs left, and none of them is a breaking change/breaking workflow. And if more bugs are found, I am normally fixing them on the same day.
All tools advertised are implemented and working (hundreds and hundreds of people buy the add-on daily since launch, at least as of today it's the top 3 best seller tool on itch.io - it wouldn't be like that if it was broken).
You can track bugs and future features here: https://github.com/pardalltools/pixel-art-studio-docs/issues
But it already has 10s upon 10s of features.