Looks like this jam has plenty of character size changing games but yours does put a unique spin on it, as usual. Well-deserved fives all around.
I guess the only issue was that I kept breaking this level:
First my character poofed out of existence, then I got the box stuck on the wrong end of the portal. Perhaps a bit more space around the portals would help?
Also, jumping while holding down is not the most convenient control scheme.
These minor issues aside, congrats with another banger!