Thanks for checking out our submission! Sorry to hear you had issues with the upgrades. The gravity one is noticeable when you jump, you are more "floaty" so you can jump further. We wanted to have more powerups spawn for you to get when you jump but ran out of time. For the second gravity upgrade, do you mean you can enough coins but it did not let you buy it? That certainly should not happen and we'll investigate. Thank you for your feedback!