I’m currently implementing some feedbacks I got from the testers. Just like the “combo shields” this new suggestion seemed really interesting to me. The idea here is to have “loot boxes”. Whenever the player gets 3 stars on a level he will have to open a box with a random reward.
Of. course, some items will be quite hard to unlock (based on a simple rarity classification).
I still have some reward types to support (health, dash, masks, clothes). But the most important part is complete.