Fun game, may i suggest an upgrade that allows bullets to pierce through boxites, i'd suggest making piercing into effect first and bouncing after, unless it hits a wall, in which it has to bounce off...
Also a cluster ball upgrade that when it's done piercing and/or bouncing it explodes into many smaller balls that deal like only a small percentage of the damage of the main bullets
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You described the effect of the explosion, it was bugged, but it will be working in the next version