This is the best Are You Planning To Slug fangame :)
Seriously though, there are some really clever design bits here, I loved the hazardous snail-trail which forced me to move out and explore the space - and then when I did, I actually found things here and there :)
I wish some things were explained a little more - for example, I only found out I could double jump after quite a few tries. I'd also like to know what the white collectibles do ^^
Even though I can't really see how it fits the topic, it's one of the best submissions I played so far IMO