The drawing mechanic is really cool, and could be expanded on! I feel like the draw for a lot of bullet heaven games is that the player constantly feels like they are getting stronger, so it would be fun if the power ups in this were more substantial. Nicely done.
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Yea - there was a lot more that we wanted to do with the powerups, but time constraints limited the implementation. Currently there are 4 different rarity gun augments: Common, Uncommon, Rare, Legendary (White, Green, Blue, Orange-red, respectively). The legendary ones are quite powerful if you can get lucky enough!