I liked the platforming aspect of this game. I ended up avoiding the blue orbs altogether because it seemed to just cause more problems if I collected them, but I don't think that was the intent. Maybe there should be a clearer indication of what the blue orbs do at different levels. Also, maybe these two ideas: 1. Have a sign that shows three orbs and points to a specific area that you can only use three orbs to complete, or 2. Be able to collect all the orbs, but be able to toggle them on or off depending on how many you need, and hitting spikes will cause you to lose a collected orb. 

I also appreciated the red spike by the finish flags. Very tricky. Nice work!

cute idea, i'd make the sizes have a bigger difference because it was hard to notice at first

the different properties of sizes were more like a "gotcha" moment rather than teaching me the mechanics and uses of being which size, which is funny if intentional, but confusing if not

i also saw no purpose to being anything other than the smallest size, i know this was a short jam and with more time you could develop more levels and uses for each size, but as it is now, i just kept myself at the smallest

nice work and good luck !