Ah I'm glad you liked it and thank you for all the compliments, I truly appreciate it!
The pickup range is something that I just forgot to change towards the end of the jam. Oh and the coloured tiles was a visual thing I added whenever food would get spawned in the feeding area. It doesn't serve any purpose other than visuals.
Edit: In the latest bug patch (v0.1.2-alpha) I increased the pickup detection area just a tad, hopefully now it's easier to collect poop!