The graphics and physics in this game are very impressive and the core game loop is fun. Unfortunately I did have to refresh the page because I flipped over and got stuck in the ground (pressing R didn't help).
Ah sorry for that, it seems there is a bug that it doesn't always detect properly when flipped (or not for all cases at least), I should have made it always flip with R no matter what. Overall progress isn't lost (upgrades) but it's definitely not cool. Thanks for playing!