Got through the first world of the game, really good work! Very impressed you have this many levels made out, and what I saw was really satisfying, thought provoking, and easy to understand. Having the eyes match the slimes health is a good touch, and the music is fun and bumpin. Would have liked to see different worlds have different themes or gameplay elements, but it's a jam so understandable that you kept scope small. Main reason why I suggest this though is just that for me it did get a bit repetitive after the first world, so while it's nice to see all these levels, it feels a bit over saturated. However don't get me wrong, this was really fun! This comes from a desire to see more from this world and more ideas you have to offer, since this was a really good first impression. Really good work y'all it turned out great!
(Also I did have issues figuring out the pause menu on keyboard since when pressing esc it opens the level select and quit game screen which was jarring, and I noticed that wasn't happening on controller.)