This is so cool!
The multiplayer had some slight issues but mostly worked! Multiplayer is very ambitious for a game jam anyway so very impressive :D
Upgrading felt awesome, I love being able to upgrade my speed in games it just feels so good - and being able to do it here on the fly without stopping the gameplay was fantastic
I love that there is a progression system with the castle in the middle guarding the good loot
The art and animations are also fantastic
Great work!