Good news! Two asset packs have been released in a new series I'm calling "Mega Level" (because it's mostly inspired by classic Mega Man games). 

The series feature NES style graphics with 16x16 tiles. Each pack contains a full tile set and 6 animated enemies. I'm planning to release more in the future so make sure to leave comments letting me know how you appreciate them and feel free to make themes suggestions for future packs. I'll be happy to consider those!