ahh i love this tree so far! i love the animations also. it's awesome to get a peek at your task sheet as well--it looks like a really great way to see how much work needs to be done at a quick glance. have you ever considered using trello? it's pretty similar and tho maybe kind of overkill for a two week jam but it's nice to be able to get notifications when people submit stuff for review + notifs again when kicking it to backlog with comments for changes. also, i'm excited to hear more about your game's design!
actually, i think spreadsheets are great when you have a ton of assets to go through which is why i understand why it's a standard for animation. mostly trello is nice when you have a mixture of tasks including stuff like assets, design, code, etc. as well as multiple team members because they can get notifications and comments. lemme know if you have any questions about it.