This is actually a pretty polished game. I really like the mechanics that you built around the different colours, especially the two colours that you choose on the sides of the character mixing to create a different colour (eg. blue and red made magenta). The UI was also really nice visually which is always nice for players.
Gameplay was fun and interesting with all the different weapons. I think what could be improved (maybe you didn't have time for this), but maybe a tutorial or screen explaining what the different weapons are because I didn't know how to get mana at first haha. Overall great game though!