Y'all make some pretty cool stuff. Glad to see you're still at it. Congrats on another sweet game!
The feel between the different player sizes really stood out to me as a win. The big form felt weighty and giant without being unwieldy and unfun. The tiniest form was a lot of fun to watch zoom across the screen with a bounce-slime. The art and music all add to the whimsical vibe for a nice puzzling environment.
Some of the levels just felt a little tedious. Needing to push a box across a level is just boring and time consuming, especially if you need to do it more than once for portals. It would have been nice if the design got more time to tighten up some of those puzzles where you know the solution, but have to "go through the motions" to actually complete it. But that's a jam timeline for you! There was also one level I got really stuck on because I didn't realize the 2nd largest form could also smash yellow blocks. The level in which you need to go mini to go up and around and break from the other side. I would go across, make my self the biggest size, and then the hallway was too short for me to actually reach the yellow bricks. But then the green portals broke and wouldn't let me resize myself down. The largest portal would just grey out when I approached it, from either end. I had to restart every time, so you should be able to reproduce it if you want to drill down and fix the bug for a post-jam update.
Overall, another solid entry. Keep up the good work. Just leave some video slots for us solo devs ;P