For the Save the Penguins dwelling and Cup Insulator, I am very proud of how I overcome my fear of hot glue and used it myself (however very badly)!
I would improve my insulator more by design and layering to prevent heat if I would do it differently and reduce thermal energy transfer. I would make the cup less floppy and have a option to have the cup or remove the cup.
The cup quality is not bad but I realized that the hot glue for the mouthpiece melts and will not be good when someone is drinking the water. This will cause complaints if it is actually marketed. There are random pieces of hot glue on the prototype and the insulator is not waterproof.
