Solid concept! Have you considered having the different colored projectiles affect enemies differently? I think there's a lot of room to expand and add on to this. Nice work! 

Cool idea! Being able to block bullets in the correct mode definitely makes you feel powerful. If you decide to expand the game after the jam, it might also be fun to have upgrades that let you reflect enemy bullets back at them, or even bounce bullets into other nearby enemies. Nice work on completing the jam!