Polyroll

Polyroll is a 2D platformer designed like Sonic the Hedgehog with some Mario platforming elements. In it you play as a roly poly character who jumps, dashes, and uses powerups to progress through stages and past enemies while collecting gem pieces. You access new worlds via an overworld and, while traversing it, open new areas with large gemstone pieces. You'll also fight various bosses wherein most of the game's challenge lies. Additional stages allow you to increase the maximum number of hearts you can carry.